Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab476ab3079f7ff…

MALICIOUS

PDF

77.8 KB Created: 2021-08-31 23:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7466abae34829aaf8d09ff709a8c8641 SHA-1: 2a87d6fe26c77ec3720a8a55f869e608bcb889cf SHA-256: fab476ab3079f7ff5c43c736865b275407964d0888da942730c3034e50a7d50c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of these links and the compromised hosting infrastructure strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7358e5b3c13ee0744686c03e21eb79d1/66832301983.pdf In PDF document text
    • http://cuakeobinhduong.com/upload/files/gomepatudovuxuzexego.pdfIn PDF document text
    • https://primer-spb.ru/files/files/60159960531.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d6c4e099ea5c8c375a8a54c56c842353/43251099206.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b3c57ec0---23023710424.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/pojaradexezakoxukojuzok.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/balusadozidolijavokodit.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/3fa6af5f5d4bf4f50d459eceef8a565b/52770687543.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/bexikuv.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/zeluwijiwukesezize.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee5f17758---rawetijufuw.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ab3aaf5ea5abc4fb6ee9e41c4c56c6d5/16280600024.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/guxuwopedu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97e4811b55---xexivijivojezetajof.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/wegijoradinatesapewitogop.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/wamemusugirefebizo.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/nezusoxezobinivusovafafol.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/rekevodinidubedif.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/jijodurusufaruba.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/kububatejujenadiba.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078b241ea65a---sudedejefije.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c919f4446f1---fegosupaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nutritional+management+of+peptic+ulcerPDF 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_off0000ccf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 10732 bytes
SHA-256: 80581780f17dac5e2de1e9b7c200670afb8c9e3afe41876607ecc27653a327e8
font_01_sfnt_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 16876 bytes
SHA-256: c13d6cc6c5de59a091d66c0d6cee1ff363ec81c540eeb43e66f7382e64824e5b

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