Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef5da0e95655bb3…

MALICIOUS

PDF

90.3 KB Created: 2021-07-23 15:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dcb1c30b47c5782b2c677640b7f60f43 SHA-1: bc2bf32610b5c9f44ac48e979ae071100c04db07 SHA-256: 7ef5da0e95655bb3ba4329a838c94ee92ce3816cb303317363f423aab9042d36
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or exploits, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95739370ef---mifusopozolupuwelu.pdf In PDF document text
    • https://mirrorlink.com/public/files/files/10980207398.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc6dc42a8---33316313629.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/4343239272.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/giwowuxibewoli.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49774de2d---jatinorexezuveb.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/79178066575.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8f1e8339---64695473465.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/30482728312.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/tetirisosuvi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/64b97a1112ccec243d2fa780fe47c76c/vimefowabunoz.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/58885974364.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160811de28690d---43078344488.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210608_005319.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b476d6af894975c45c668a280008ed67/7667415516.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/temasasamiz.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/69394444280.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/10910380606.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607919482fced---xifojizotulubu.pdfIn PDF document text
    • http://giga.sk/storage/file/19128593484.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/21275411250.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c786ca9eb09---nogesetagivefowunakidosug.pdfIn PDF document text
    • https://zzhqhi.com/d/files/70229476798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=can+green+cheek+conures+eat+melonPDF 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_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 17296 bytes
SHA-256: 86976bd3d0528e326b849e411d6a34b4ee8ff66c17e6090975447fba1ef76231
font_01_sfnt_off00012992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A9 10808 bytes
SHA-256: 443d8497000003e1c259f4bda01ffd276176b7c9345d00d2279e97fbd0e165d8

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