Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fd5100b49cbe71…

MALICIOUS

PDF

95.5 KB Created: 2021-08-08 20:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32f475965818cc34985899a2c8a1b56a SHA-1: c454f81d7b4e07e7f051b8d5af2d159920926100 SHA-256: 31fd5100b49cbe718505a2284ffe9f176fc76cd464cf98ff941639217da243ab
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism to host malicious content. The presence of invoice and callback lures further indicates a phishing or scam attempt designed to trick the user into downloading or interacting with malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ucinnovation.ru/admin/ckfinder/userfiles/files/69850962602.pdf In PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0ae313bbeca40868ee2e5dd2b6e14d31/75706380687.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/deb11c3ca2410981aa701952de274592/vidoguruzijukalubo.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/c2stlgqb4379h0g1iqrekf8l25/97005128139.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/34993883321.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/1f2c474af169a6e097410ee95cab4334/pitovoposobis.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/85981776341.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/gepelevaka.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/36738185697.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///gawidogumipinubunolid.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021053011380973499.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105301053582055.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c689dcb7---44313327093.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/2249111513.pdfIn PDF document text
    • http://espwireless.net/uploads/file/lurenukufagaxekaz.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/86846658561.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/xijipaxibisuvo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aecd1f16fb---64241112064.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-6/20210806032443362229.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/xizix.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/48961503593.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/af982e984fcfd5e7688daa8b4b052865/lepalabemazegapimebim.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bf29f2831a0---53169479677.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8947ee18cd---baribedimatixurinugu.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e8fbdd021b807a79c70d5e5810458523/sopumegemuzuwiliduludume.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/52747426553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rent+receipt+format+excel+downloadPDF 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_off0001122a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122A 16928 bytes
SHA-256: b76204981f3e4b1414e6fcb18b71b25b22be5eb6344213a0110c5b90a0e4a393
font_01_sfnt_off00013e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15659 10848 bytes
SHA-256: e025ac3f2b9de2c3f825e5fe8e7aa2578a41719ee20d3cc841e30a7d42f8ada7

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