Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9ff335334f4276…

MALICIOUS

PDF

157.1 KB Created: 2021-09-05 01:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da87b4a98e6b2a5b41df5dbee5cb2f67 SHA-1: da2c845a4e52e99ed41aafb79643f7c51e7807dd SHA-256: fc9ff335334f4276b4ebeab7a7c8172e1f0866b468b415b77035d025e6e7353f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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 https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/6fnee9uo0gbcj05ag4nruac817/99480796987.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcc0e89d11---37146471289.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/69790526271.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160771f2ba476f---65253380568.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e3673a9b6---89409292006.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///mazebere.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/dalapaduvilosobaviwa.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/kilaweliku.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44d6558ff---pazuj.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3f0c26c9---55871770815.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fb589cfe9---rixegasin.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/zuvalunuf.pdfIn PDF document text
    • https://activepymes.com/pub/file/25169158817.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/xukasozixabudasiveke.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/79287965113.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/18774563588.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e51d0a12---82490970509.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/kekigajixozisotamibamo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f1a3e7542---16061533032.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/6273561669.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/eb717e6ceb2f9674848197d0ae9fbd3f/kewojinaxedeneb.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/waxawitakiduvevewaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tenda+ac1200+ac10u+manualPDF 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_off00020435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C4C 10312 bytes
SHA-256: 154f66c6a3602d2cad61fc86d923daae5484451200850ad46a8e013a6591db67
font_02_sfnt_off00023395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23395 19308 bytes
SHA-256: 0d8ff427873eaba7854f32a825a0fd01583817bbfd803e1f986309bc33346776

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