Malicious PDF — malware analysis report

Static analysis result for SHA-256 1880557610aa7464…

MALICIOUS

PDF

89.3 KB Created: 2021-08-07 20:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f94905075847398e41b57618868b4a38 SHA-1: 3d1c88beab21cd7e94f7f4c6185ebac68b736574 SHA-256: 1880557610aa746486d01ff524bedf887b94634fc91db9d44188ab4c46dd5918
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm pointing to various websites, many of which appear to be compromised WordPress installations, likely serving as a lure to download a secondary payload. The presence of multiple distinct hosts and the use of disposable hosting suggest an attempt to evade detection and distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/jewotudipoxezali.pdf In PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/314ec8eb32488efd999d30f87611656d/34975905453.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kevet.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53948bba3---wivitixezagenezufevi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee07273d110---bupebu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4b58d7ac0---91060001675.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/linotalovazopebivusudivad.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782a430bfb9---51302980479.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/98783092731.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/65694061279.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/89558099771.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076358a72e69---xemaxi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0c7e1745ad27d99122c4554095edc788/9393332885.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16350b743---zubekivoguxad.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4bc193f9---pusoziverivuzipetilef.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160882b3952f2c---luzusofajixoleragafokev.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lopewifakedumunaluzuma.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/xegazojiduwopigupebe.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/82812402938.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/58820799122.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/3toumnnergskqkbe8q1c3d02lu/5017332331.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/gebiniwanewe.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100e96886d7c---gafedak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=chopin+waltz+op.69+no.2+scorePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 17824 bytes
SHA-256: ec30f6a1854e654f692f555d36034e88cff30af8ff3ff52ea55cb08fed3b52e4
font_02_sfnt_off00013ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB6 11168 bytes
SHA-256: e09ba2aa9be008ba092ce6c7d230f68f103c010a3b4d69276d9bd94bdc863a00

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