Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d81e036971fc51…

MALICIOUS

PDF

83.2 KB Created: 2021-08-17 16:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3526295f277a1f580826f2d38d295c31 SHA-1: 114b153ac2bde2caee04e79fd8f7265509bf7c4f SHA-256: e4d81e036971fc51bb19c199c5a68fffaa9729ecd3514d71e547cc6bfacc02ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised or disposable domains, consistent with a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=1996+yamaha+big+bear+350 PDF link annotation
    • http://heydarbaba.org/resimler/files/52058436063.pdfIn PDF document text
    • http://abpaluso.com/upload/file/15993135360.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78b93d81fb---zalotolanelodan.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/066763ce1c69200cfb7a1a2821ccff19/18549618978.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608210e2ded26---nuxetejigodeko.pdfIn PDF document text
    • http://4bx.pl/public/file/15098654083.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/wafalisotala.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fepunisalofuseli.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/lowomaxoxed.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/luvidakuvusi.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/78969327861.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/zezexulif.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2af57e380e38bd80bbee7a81ffdfa158/dexanitanirixa.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b08214f7c7---62845076702.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/rf1vd1l6hkde4q3sonb7ki5hos/joral.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/4872852073.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v06b0dtfliarti73c7i4o2jhg7/gagarosarevivi.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/47094084052.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/85280529772.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0fbd02dac7bffc907bee9fde9ce76827/27031456557.pdfIn PDF document text
    • https://schmitz.cz/res/file/taxuvonulosokam.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/zogikoxibiwar.pdfIn 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://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_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 10992 bytes
SHA-256: 225ae4ebb3faceadb88dd00ee7e212c588e0c3eeac5a42271dd4b03b1b8240e6
font_01_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 17284 bytes
SHA-256: be3d2fae073fea7a44bfd5c3f6620fbeb72c17cd612febc38089ad48568971f4
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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