Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8a3f889aed0810…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 10:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a98c453ea40e48fbcf65edb68720e941 SHA-1: 629ced47a03cdb142cdfab36b5c856af116af047 SHA-256: 3e8a3f889aed08104574c2e90b38516d0c2a29aced1e053b983ffc247424afb1
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a link farm and the use of compromised CMS uploads indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://live-lessons.net/lcj/web/uploads/assets/file/folazetijonirig.pdf In PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/kubewudavovalibefojib.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/66494570078.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/832a50a69882eae60eb16d2546990049/65274052363.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/87997673507.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/52120248615.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/20375044952.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/pabezovopixagufabepeb.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/xamerigepijukovudiz.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ttkkg8p3mrtg76ba4dr942380h/sifegaxokodiwikidilakavo.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/90803899731.pdfIn PDF document text
    • http://fkhd.cz/data/img/dubiwopufa.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/vofuweni.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/35026695760.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8b8290d6---xeguk.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7a980b1951d712c2d21fc771e9ad4bb6/folerodapasape.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/lewodesigaze.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/dotomijeneja.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/51608987238.pdfIn PDF document text
    • http://agrion.org/upload/fichier/takevonezepozur.pdfIn PDF document text
    • http://finchamauto.com/pics/mejegox.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/64027228794.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/10974904562.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/51802701972.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/xopasotujivufebinawu.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/roborugodek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fnaf+download+iosPDF 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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 10080 bytes
SHA-256: f9ce20c77c8ceb1beae7ceb58b7ce9b3bd570f51a87adc3151976c03199d4dca
font_02_sfnt_off000116ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 17488 bytes
SHA-256: a9aff4e378aecb7789ef9fca06b1f4e88121926e7c7891aa62139a708badd4d6

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