Malicious PDF — malware analysis report

Static analysis result for SHA-256 810d23a81a5350da…

MALICIOUS

PDF

92.2 KB Created: 2021-09-04 11:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 201d4dc4251d09f6c339f81f8aec3aba SHA-1: f5cfd5e9ddbc86020bccc445d5b8371e177e7a88 SHA-256: 810d23a81a5350dac94d3001a2c7b1cdb354a24b47280d70f66f3fb942832bf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. While no scripts were directly extracted, the nature of the links suggests a potential for further malicious content delivery or phishing attempts, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://special-pharma.com/upload/files/gutimune.pdf In PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd13ced79---71233470512.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/rukujaropitozigapojilubi.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/nefitotuxusebamererexe.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feae46a450---10991410940.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3d9b7df11845593c04c1cfbe5c9c25fa/nidokuzejavapegarefe.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/af3aefef3054eec536396e1e6795abcc/zexanavet.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de3d9335a8---gemejis.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/14791306406.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090693b07603---dofovawakefikegep.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c37ab0648424c8356244faa5a4c0258a/vopofewolober.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ab1a6948e18713cc194939acec909573/17516991178.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0fcbea81---zesojevetaweref.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/5033177129.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a00869153e4428fa1764fddc2a0ee881/pofawixipotibewi.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/tuwitenufepefasuw.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/4vdg1uvsh90ueivr0nl1lo5f47/savexupabamula.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/luwob.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/87889626039.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6d16ecd82cc555cf9e67387f55ec0078/retuwu.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/fedekuxabolemowis.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/zekodibugiwajopesuzeli.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f79955d0fd5---81302286218.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/17224365516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=introduction+to+forensic+toxicology+pdfPDF 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_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 16324 bytes
SHA-256: 800a382e40a6d2be4fd8898f7783bc4729ac43692d74a50bdcb05cad6bf0b907
font_01_sfnt_off000131f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0A 10900 bytes
SHA-256: 8a709a9df0889e906da132c894bde22e72a3ffbd4999cf219b9f60743f3d2cac

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