Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8272d766360f83…

MALICIOUS

PDF

72.5 KB Created: 2021-06-13 11:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5f42989324140f1cec75ec1bbf835f0 SHA-1: a5f28feb552ad9f9235082907082a41f9f07d0a0 SHA-256: ac8272d766360f8360668aa300a21fc3a659601ccfaff83366ad25442bce74ef
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=new+hd+xxx+full+videos
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/899b7004d158bdfd90d68b1508516875/puxotugipowoxejijabesirim.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/63779275472.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3fb2bf89---25901289528.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4f314800acf056d63ea27bb91ab11e07/gusitebetabosewabojopi.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/30dad2cf52a2b27e19a903f5f5a18fca/pamabidodiboxodim.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/49d4c88dd3c79e308852104e02a1a58d/lubapowawaf.pdf
    • http://lab4050.com/upload/editor/file/97081453897.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/2320777392.pdf
    • https://aravlicraft.com/cmsCart//upload/file/5942149751.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/914eed27006d108ac7586f163c1da5c6/61435942475.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2da8e44f0---nadoxuwopevafutozoper.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/63csjou25qha8jabt6r55jb282/76775994785.pdf
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/f6d0399560b3c8a712ba2c2992e24c91/xitadodawujiniwodovubojot.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4caf02624---turewitalufunamenu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2f.bin
15268120a599acc4f895c0907e03cdb76a38cbfe8f55ddf16b84d0caf84a9629		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 4880 bytes
font_01_sfnt_off0000efef.bin
4ed3c04f3be484ea42259cf756ea873a39d403c403b625189deec5ec7ac59180		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 10564 bytes

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