Malicious PDF — malware analysis report

Static analysis result for SHA-256 862637ec645473a4…

MALICIOUS

PDF

64.0 KB Created: 2021-09-27 19:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9be5206b879886e76746618c040df469 SHA-1: 65f321f0bee0dc6874f226b8519327c9282701e2 SHA-256: 862637ec645473a4028dccde053e1b8a6f6b4452eed50a5abe8020417d78c6c7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6902

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://nomylo.ru/uplcv?utm_term=barron%27s+toefl+ibt+14th+edition+pdf PDF link annotation
    • http://gavionescodeinsa.com/userfiles/82386076404.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/fiberedewujagirujixoguwe.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/29215177791.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-21/20210921230327815674.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/sigupamudituteweb.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/94833339876.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/15134983504.pdfIn PDF document text
    • https://emenu.hu/editor_up/61869055461.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/33281475843.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/67594338247.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6b46ce3000fa603d80ff111742032264/daxagodibobemomipewuzo.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/domodotubowomovasukumev.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/wusodurubafamo.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/pawazarabujazomigenoferu.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/33884175292.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/61723051807.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/3259135739.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/20256229388.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/85cbade5c913e3237f662166665ecb08/xojizusi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf36981ef0---lekud.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/11798035502.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/74676636790.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/32173106048.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC66 19648 bytes
SHA-256: 2b6896ad874859271fd24df2b239026696097c32753fb25b979ddde5aefdd4f7

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