Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe82537c822f9be…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 16:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 648070fc9163792e945204e2103dc30a SHA-1: 9714350ef4b5c41ac330388142fc6266199cc1d3 SHA-256: 4fe82537c822f9bee9aafbf7d2a3acbb4ab2bdb8f237f9e208fca82a714fed1f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of a link farm strongly suggests phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://atut-biuro.com/uploaded/file/viturodufoluxufenojeg.pdf In PDF document text
    • https://esvigo.com/upload/files/kigirozi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fbcd4a8483370e738665cba03a6a2418/xuwitadomekem.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/qsa2jtek1dq3r6jlkdc0442v0j/jodosalaf.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca015b8363---loxegakimakojor.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/turanuvimavuwuzoko.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tipukova.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/25966058706.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/nerovuvasis.pdfIn PDF document text
    • http://wawa757.com/uploads/files/sisusopal.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/sazoxiwidujufafale.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608793b687c19---67285497144.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/67775303456.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5da3660307---66157852765.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/28/file/80067342592.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a9cdb49a3d3b2729c28eb23387cf94bc/talurejuxosalumor.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c5dc872ab---67871131902.pdfIn PDF document text
    • https://actorconseil.com/files/file/rutumejanoravawukal.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/rewinipura.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/zifabidewid.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/h3s3sp5v8hsbn6grkcikvl83d1/21873121779.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/manenonivefudidiwekunof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=diaphragm+ultrasound+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_off0000b9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F3 10916 bytes
SHA-256: 9f6ede20a917b3e446bac79cf2aa8a84777dd8c5b5e3167f78ed6fa766fdc91f
font_02_sfnt_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 16844 bytes
SHA-256: b33b9b37b3c83b0be7f6828c4a516444069f8125576f36ffd5f761be71b45a77

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