Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec8fb23434bb581…

MALICIOUS

PDF

86.6 KB Created: 2021-08-11 23:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e68b4e1d2c91d2e0d6b02f0f765c810 SHA-1: 45b2a902a978498577eefdc6dcfac2be650a3da6 SHA-256: 3ec8fb23434bb58144015c330522dbd8a6bb2c2dd4654292876013b62a531429
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=how+do+i+file+a+representative+payee+report+online PDF link annotation
    • http://wohingltd.com/userfiles/83385852063.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/588529068fb6653bfd1fc469b127e68c/tuvaxik.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/pevutowetiritano.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/2aeb6905c589145903860f8d48d9daa3/ferotab.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/keh3p3ek5gs22pcot1ubm9r591/79131357744.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/93768800719.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/21470143530.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/27086650005.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bccd003795f---vefesutomun.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/mutedujogan.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/81445330500.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/47013649976.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/45373607648.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/50806250719.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/82444395025.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/68241897115.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/woxuzaziruwesuxufiguje.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/baroboxo.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/03a9ea0b58a2d9cd8eaae36acba554b3/luzekijazifitij.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/nunerosaxepetegu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607656faf27da---jesejexavafijoxopamu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d82a9596b---fakonu.pdfIn PDF document text
    • 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_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 10748 bytes
SHA-256: b1a48c9ce0690a5cec0a995ae827b18bb05c0a79a50ecf4763e7ce5640eea21f
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 17128 bytes
SHA-256: d3a48578e80306787d54162f6b9d21f071e063710640f97ccc64143090cb5a94
font_02_sfnt_off000131e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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