Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef6849c88713b9e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 01:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b0cf4d0369f9c6e7a3c6cf0025623a00 SHA-1: 6915355f042518dd3b9332b4762f11ad32e002e4 SHA-256: fef6849c88713b9e54b0311a9b4dcb9f8195e3ee115280cd64c00bba24e85aca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicative of a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5815

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://tlca.com/Content/uploads/files/rofebuposigogaruzagiwuf.pdf In PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/silomin.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/7336095276.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/rozurepenawabomuseni.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/sudinatesibis.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/92938349875.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/nanejofope.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/bemimadixi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/jc16m31fvfuv1lecjs2apb3sl6/nuvupunosu.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/kitojipixatowimidifam.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/59194355097.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/39752225993.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/sanikinuduzavar.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/35435088682.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8aa2d447---55804314109.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/danogi.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/37762520717.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/57288017095.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161413dc9bd210---92556188124.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210919031010.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109190532484254.pdfIn PDF document text
    • http://podarox.ru/public/files/foxubugami.pdfIn PDF document text
    • http://www.bash.cl/media/file/95389409168.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/99071361098.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161424c56d774e---juzatofidavipepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+download+windows+on+android+tabletPDF link annotation
    • 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_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 17380 bytes
SHA-256: 95b7ffff9aad4e2bdedab640ddad69fdaf6181c12015b6bc989891d32ef45ed8
font_01_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 10456 bytes
SHA-256: 28ea3b01f7aec077b420ebe89adef5607f0a0eda95e3b274232e969ffaae5711
font_02_sfnt_off00012155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1