Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e416d9c0914678…

MALICIOUS

PDF

69.4 KB Created: 2021-10-08 20:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8b7b850f86b62dda32b0b5a9a7eacdba SHA-1: e4a0ea7fd357c8a6e1a01304cdc18159104cf5db SHA-256: 39e416d9c091467838dbf1cce2f5f86da15e8405f415cc908ae34a1c8757b8c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content indicate it's likely part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=ox+plural+number PDF link annotation
    • https://panificioilcavaliere.it/userfiles/files/nagulirexa.pdfIn PDF document text
    • http://logicamail.it/draft/media/10783587141.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fisigelobuzodojusiwapakis.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/karidumawowiwuverisazoxap.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16148cde8c0ab3---beputoj.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145d44cbf805---19003086529.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c68adad604---pafejupizedowurolugati.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd641318f---xomuwozoxudotubawinez.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/bomizewuwixilaxudiren.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/kigodogarekate.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/xalonesuzutovig.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630613811ed7b3d0fe3ac263bcabd.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/37317349475.pdfIn PDF document text
    • http://vswet.ru/f/69501690279.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/gufisuxolinaliwun.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-6/20210906015111671753.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/jotojuluzega.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/kekirafidajopinijikiponi.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/33012621109.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/89812912359.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614478526338e---4817228019.pdfIn PDF document text
    • http://drironcat.com/images/file/68994728216.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050518053182.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/74027714007.pdfIn PDF document text
    • 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_off0000b32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 10300 bytes
SHA-256: 481926f94d4479837ba394cbfe1709e3808cfeadffd4d3397602fa501497821d
font_01_sfnt_off0000ca27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 15140 bytes
SHA-256: 06c5f1bafa44262027b66afd9ebc0358a801a030ead07c40f58cbd6db1721617

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