Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d008fae5e691f5…

MALICIOUS

PDF

105.5 KB Created: 2021-06-26 11:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf8ee65e7f987b5e12762ea467705916 SHA-1: d1641d00317319c62cc7e3df6884152b8537ed7f SHA-256: 98d008fae5e691f5ec8314ae2ebfb17ffab72ee86ced1ed7cb97285aa1ed3769
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a phone number, a common tactic in phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ketchas.ru/uplcv?utm_term=meaning+of+bold+in+english
    • https://flardochform.se/userfiles/file/57916488957.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b2f38d9ed9ed7a592fc9dc3eea3d3a5c/sekonejoxafokelev.pdf
    • http://abwrichmond.com/uploads/files/xupanenij.pdf
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/48580108374.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/ribiwodesenudawir.pdf
    • https://go2germany.ru/files/file/xegaditupa.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8e55fdee58eeee754c3c320d41869f3a/gebugobo.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/fonavenulizil.pdf
    • https://bestofbucerias.com/upload/file/94319584253.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a7f618e5---2296397562.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4749719e---63865930422.pdf
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/31413364628.pdf
    • http://maasmartcity.com/userfiles/file/9580548830.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a36bd6f56---89544259210.pdf
    • https://robertbah.si/files/file/gimatonelipudepozaf.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d1f1f149---goxipo.pdf
    • https://securitydm.rs/slicice/file/60800437057.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4112432775---40356502695.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/3hcpddvnl09i8aeo4m0padu5s4/xazoxorukatukekoragixul.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/db1426b8cda5f63085db1f08cf1501a2/74476469970.pdf
    • https://lukili.ch/UserFiles/files/bawizum.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84669bb12c---sirugovizitikusojedow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010795.bin
b11c2cd24abaeb5063ab208d5db77836297a7c67e35ca5af520b4f0d4aa9a399		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10795 19960 bytes
font_00_sfnt_off0000efd6.bin
e077cd591e0a3eaf4d892ff5b17c45d709d0b2ccccd71e7da2bb9d671d3b5153		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 10568 bytes
font_02_sfnt_off00012ae3.bin
c4f35e3c832ba2655552004385a90ede2b76b9b5b0ca2e29391ac5ac23592016		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE3 28412 bytes
font_03_sfnt_off00016e2c.bin
e409338b52911ca0681ef6b53a2346d6a4d624ad2a9f143f56eaca20f6c80557		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E2C 4864 bytes
font_04_sfnt_off00017fdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17FDD 16792 bytes

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