Malicious PDF — malware analysis report

Static analysis result for SHA-256 581f049ebe8a29d6…

MALICIOUS

PDF

101.8 KB Created: 2021-06-27 06:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2302a3b873e72ae4d5ede97d2ff605be SHA-1: eeceac120b11090339b649ddc7fbaddb419199c6 SHA-256: 581f049ebe8a29d68cd8fd442988d25c4582e9bf0630bb720dce9692be8331c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://kingbikeonline.com/images/upload/File/xerirugumalibexojigew.pdf In PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/7bhce4s5sqbcogqnb8240iqsum/38550139043.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/miwewefikogiradurolepirud.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/2618fa1900223e071ee053de4697610b/kavibovakamakeg.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/26500073510.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/65400027393.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/terixumoropukezekal.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ae45df5a7---49881137520.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f0b202e2b---nogunewejoguxi.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/e7284ae28036e52d3674018a48554442/fesozux.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/52562691768.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/48057247246.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/22586458248.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb50a060e8---mebetamuvigurik.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609507aa287fa---vomopegiwudelib.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083e6b21473b---9909502997.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609732fe17ef6---posiwajozenakamujakowi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/goxiduvovinusemuxikagagi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/3cv5vq6qv05qs0v0s58ilk3c85/63349667478.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/7696516462.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/sinivaximojox.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa039e3135---dufel.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b664cd9508b---vonil.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607695a97ad76---jeruxixutolaxog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=can+i+apply+for+self+employment+grantPDF 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_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001412a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412A 18480 bytes
SHA-256: b79a01475dfc91f4e9706cfdfdc59f714c1f45cfe3262db75440a7bc57c4ed3d
font_02_sfnt_off000170a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170A1 10844 bytes
SHA-256: 4c8eba34f54898e77b12623bdba253a80c1ded88ebd8b71baf5e147ed3d3f2e0