Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7f72f8e8b3eb1c…

MALICIOUS

PDF

69.2 KB Created: 2021-06-16 14:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 81bd5291312428adde877219e7f7c196 SHA-1: 3d3fe86779aed38b5340fc7eb1781285169fa399 SHA-256: 6a7f72f8e8b3eb1c820c75a753a8f1e8df5c28c9538cae85fe1f5c50dd465281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a calendar, likely to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=calendario+2020+con+semanas+pdf PDF link annotation
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ev2e58h778h32mksrasl503k6d/porowesuzipopajopukofojez.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ba80601bcfd---87807661912.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/738b1e773e1b7c14fedb5c6462a25ef6/dimufonebamagenulajeneno.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfee95c0a93---31242322672.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/neluvesapebetab.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6adfa966ffbf1689f26dc54e55ac7b64/83130937732.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/c1fe28c475ee210d6177a704756b4715/fesugifamotizimapusax.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/wudon.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/j9ilhft0mifq7q50o9bmjjdful/89444755628.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/44865754317.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/62049136775.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/86004122453.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/34108712686.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/716646855f04598414a245636cf043b8/71099938181.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada41a45c9---bepujojibaditogazolit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE51 5480 bytes
SHA-256: b728c88947e4f3c7e9349cb5de4ec63eb84c00534a802359cdc57afdfe1aaaee
font_01_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 11732 bytes
SHA-256: 4ab9f7563f05fabd6ce2fda69bddd7c9dc657a74c60b667aafb9e8cd7d73b006