Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c29512aba5e043…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 09:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a808f0818c3816d53011062da07f7aa3 SHA-1: cb9e8800eda4d101182d73f47e94550c0bf1a483 SHA-256: a1c29512aba5e0432c573afe8e0d7911358ff1ea992e24c6321adfff8004b255
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://egyseg.eu/ckfinder/userfiles/files/lematoxera.pdf In PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/55644466285.pdfIn PDF document text
    • http://scro.ru/pic/file/jerozo.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/rolabibajixutijazivoselop.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e64866a3fd---77071796036.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/fapapeleramekozovamefap.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/62026585419.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zovikofusodibutinotixa.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc013dd22d8---45648205387.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/pfifgob79a0trmbsknl95bjngh/83744246028.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/xilosovanunizavipizul.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/928691717f14bf5f0aabb52b158bbd4b/marizetijujageguxiw.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/wofobalija.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/62f9854a35f3ca1c6f0a2b6926da69de/33851935762.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5f46866b8056f9d98f743975de4d183/85227338937.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090711335870554.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde0d84043---77858003125.pdfIn PDF document text
    • http://rubensova16.cz/files/file/14115908885.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/5062354b2946105167ba466103c8f80c/wixapagafolesawikatoge.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161255d3cf14bb---danijunejupevute.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608356c80e582---dekek.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/62033273679.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/9e1a4af7aafb0524d48eabcfb4f25bb6/xetirasulomiwi.pdfIn PDF document text
    • https://eniedu.com/data/file/20210815111248.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/46080457612.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609465ec64c72---ravejananakovutun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=excel+sales+forecasting+for+dummies+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_off0000ce3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3B 17720 bytes
SHA-256: 3a79fdb075cc6a813c289f8d8dc836bb3c5ae6e5ff43d0aa7cdbe07bae844fb2
font_01_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 11148 bytes
SHA-256: 9437d862e5f0310f30164b5137d3cc195347564e5326b8241ead748e157a94f2