Malicious PDF — malware analysis report

Static analysis result for SHA-256 6858f3d4e7182212…

MALICIOUS

PDF

90.4 KB Created: 2021-08-11 03:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae672293ca7944dfcf5fc43d3fd4bdd8 SHA-1: fddc59372920d9d1d018ade6da6480d76444dfb2 SHA-256: 6858f3d4e7182212f922b25363ac440d509f0eab7305e11bd91ff99d138a1c0f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ttmplus.com/userfiles/files/6524758084.pdf In PDF document text
    • http://iaestedresden.de/userfiles/file/vuxovuxukalu.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/zojezisupajukuvifovebe.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5d9780530269de3e67f57cb6d0b9d2bd/xaruruxivarigilamol.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe10abedc87---bafugudotuzu.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/pisubivuledodolese.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/e3rsg3m3frfkettqd3lnab4ic2/51222555966.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/92116857454.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/teludijo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b54f63d6713e91a804d46fc994bb7ae4/36952291597.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ee3f6f24e0f27692f5a5c6c27b91cd5a/fugokavit.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdfd7c44bc---manudinedefabofiviwojowiz.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/kudidedoferewilasowa.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/flnltijgnqbee54dfifo9oqa56/xejugola.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/seronexiditis.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/9d6212a7ac2d64d07aa13522c45b05cf/49377413819.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/21214255667.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210706/file/1625502306.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/86474850521.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac865407e8---11821366818.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/zupesemasaseboxafowa.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/somizoninerusolitevejit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=como+baixar+autocad+vers%C3%A3o+estudante+2021PDF 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_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 19672 bytes
SHA-256: a770ce4c1a0bfa4e9c05727b8542c9b093eb68b5449be7c0b70ca3e99a34752a
font_01_sfnt_off000125b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B9 11484 bytes
SHA-256: 163ee1991a2ef8eea348ac23584c5218c4557cbee9eb4bdc133914079d98e017
font_02_sfnt_off000140a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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