Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc07d0fb67db8df9…

MALICIOUS

PDF

94.1 KB Created: 2021-06-28 00:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1103be5f224aa184cd9e9989f5d2c3c SHA-1: f8b43f1bcff85a9efd0836103778c6dd5c34d798 SHA-256: fc07d0fb67db8df90916792f34ec85258a747ae47818fda6f01e7cb38b7620fd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host malicious files. The presence of a 'download button' lure and a callback lure indicates a phishing or scam attempt. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc11a3d5c7---1607625714.pdf In PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f7524e03e46150ff87f090ce49ce74a2/jazesofeju.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/37038071745.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/basusiresojepasuputadap.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/zanax.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/69868146310.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/12341061343.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/738a44cc2586f177a4de40461a5521c3/muputowikaz.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/7424211669.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/fekp7bmed9j02jm5savon7c7q0/97350447699.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079067264258---zekulezununabutab.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d38caa0f9---54903922153.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/85715603960.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/92993665734.pdfIn PDF document text
    • https://wagaskar.com/media/fesenoda.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/620bf644556af39a66bc1c31f1f4a551/malezunalopakotumegipad.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78c9e249c---nukekaxiresekomiz.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb49955eae---bidusutarumapupi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160abf265e8b87---33895007951.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/34815144853.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afd12fb5fae---5244774366.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/rdsmb06tdkgfoo263t9e9p2e46/85947964438.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/vaduwufesemevifipirorolim.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/2kn49nmkae64mk1146b46p43kf/sakezonar.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5laiad3pg03ls98phuigi9vtu0/napusoredokijekomudi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72d7ea2c11---59897366758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=call+of+duty+4+pc+download+torrentPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001206a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1206A 17492 bytes
SHA-256: 61b38a0f1425e170c41c6c2237164d227be380a73805ba83c5b76a5382ff733a
font_00_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 10764 bytes
SHA-256: 4ced1be88427affed0d39a6e062c56193fb3e8f12a3a41275a3a2ca0d24b64ee
font_03_sfnt_off00013a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6C 18864 bytes
SHA-256: edfa51cad95fa9107c8af6f1cf68f21f53a7eee9549aff640a82a23a1b28994f

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