Malicious PDF — malware analysis report

Static analysis result for SHA-256 66457a7b2a875827…

MALICIOUS

PDF

89.5 KB Created: 2021-07-04 03:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a15206f0130851e9a56a57847e990553 SHA-1: 80854afc75a08f320a53e133a06c29b93913a9a8 SHA-256: 66457a7b2a875827798fcedb79ed185de88bb422ceb3626a1fbe2e093718a544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/4gb3bbbihlgnds950rieq938r6/72367321758.pdf In PDF document text
    • http://suamayin.biz/userfiles/file/11012163409.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084c73794b85---nemivafivo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c1f22f533---59593651722.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6af2e86cf481a45b2e5c1b771f5beb50/35000012241.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/792223cc859cfd523bc847e3edb0b7c8/xesemoluzikoro.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1dd39132c---77094426194.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/timewalepubir.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8af6fe0b9728d9e4d35476d59b9ff58e/modumonela.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/33873075713.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/57279688822.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ed7c4e42d56ca87664a2679a9b33cca4/merubugiji.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/pogesozovezewizisejurulav.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/30119782495.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/afc47afeb1fa5c3ccbf25a841df57bc8/84320716256.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083d861b997a---vawozinitidezuf.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/puvolibijunelisozo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5e1612215---745059360.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a8dba2608cd0af14ec74619a9f81be7a/96419235328.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608315b40c2a9---37220144263.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/faronunusewe.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/heq5ipdhltadfhh1a09tfu6go7/miwubimisafikujepojalib.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795f997c93d---zixelixafobojumoxuwuxow.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62442247322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=spiny+dogfish+puget+soundPDF 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
stream_002_off0000f9ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF9AE 10760 bytes
SHA-256: 16da23dc021efff554bd5097c36a836a381b3e48481e0072497fd5029900b1cc
font_01_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 17324 bytes
SHA-256: 9410e356080ed2614252d55b8d6c729376c87edc8923de7585dbf8df4f9c27d9
font_02_sfnt_off00013f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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