Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2f5b1b6a9f14cf…

MALICIOUS

PDF

82.6 KB Created: 2021-07-21 05:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11c4af48b0437df1ed097338e192efca SHA-1: 11d0a4eb8dfa62d106dbb49791fec527bede0eba SHA-256: 9b2f5b1b6a9f14cf33e52a3b1d21d286727e40f071bd8a089e16372260f39685
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing or tech-support scam. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a larger campaign to host malicious files. Although no scripts were directly extracted, the PDF structure and embedded URLs indicate an attempt to trick users into interacting with malicious content, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16085855cbc7dd---64499178126.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1d899a9220d99994dfff638109566e28/13998038841.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde367d8cc---56971750749.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e6f86e793---minubideneboziwosexowoj.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/58766893664.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2e533b994---55940927256.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/nibubipareminobipeloga.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/r68pcnh3gioi6i7j1hltf09bph/40556493836.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/92470946055.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/73337072024.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/18mi7moh1pmampm5ndnjavilp5/bojazar.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc776e3f9f---dapuloxasolavixogifiwobub.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081d76e6fb0c---1589992481.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/1f5b27b1c7b5863ede7b66fa0f1c3c27/ligipimurowavofolawud.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/23778219891.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/3592995155.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/zafew.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b5979dd1---koved.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/cc70508e166d9ae8221d072733f4239a/45212256449.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f76c9a5d606---73380141250.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e03ee5b5ae4---50830000014.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a909315d19b---doxulegawixitazesufo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/18d5b4e9c2870e7c67f82802a7aff4aa/44273176560.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/pimamikibutakodogamajuwe.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/2465331852.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/73463098673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=4+letter+words+from+dollarPDF 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_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 10388 bytes
SHA-256: 5627738bb856051b371021b878b0f18d88d1404e31833fadc464b359a5a114fd
font_01_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 17996 bytes
SHA-256: 77b7d6022afef75ca52510005727e09f6d98527e16f9a8166fea4f5f598db85a
font_02_sfnt_off00012517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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