Malicious PDF — malware analysis report

Static analysis result for SHA-256 345e79d94e710b3e…

MALICIOUS

PDF

109.6 KB Created: 2021-06-26 05:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d7deed8d2c621318c3ad3f50d0b3730 SHA-1: 2fefb9c57931575053c19b1fab00ffc1fe6f27ea SHA-256: 345e79d94e710b3eca62cfbbdf2286722b49585e7bb8d4e721be2bec312d0850
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, aiming to trick users into calling a provided phone number. The presence of numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggests an attempt to obscure the true destination or host malicious content. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of further malicious content via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://crysiq.ru/uplcv?utm_term=have+the+pleasure+of
    • https://sealskinz.ru/files/file/52386452305.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b88b3c8e0fc7614e46579b0b06d65d63/lasujane.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93a16af2d6---xodonatefuvatovaxase.pdf
    • http://stalmont.eu/userfiles/file/sexezodi.pdf
    • https://koncnc.com/genelresimler/file/47573921403.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c864e19f875---31934353987.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dc098adab---nedijuj.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d0ca1bcda8c7e893851188f927a9e03a/65331240400.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/36c088866c958b79b05e02359e8cb496/ginebevowonebakuzilukidi.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb396c3c9---zojipozi.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2d36f9783a0df35c4827e32343a7d019/10140692221.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/46955415851.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/e9b268fa3713c7735f4ca5987ae93699/rosujimiwipukedale.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ljt5ugmc4q7oq0hnp5fqn42cm0/54936056045.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160782284061f7---11213351534.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608719137f298---vakefisum.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b08f1ed8f---40428321065.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/38086991634.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd152e497f---favugajomig.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075b5d1ebb88---gabatado.pdf
    • https://bobecoingatlan.com/uploads/editor/file/15020380364.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/ukt5s7473p4s69nqjnosl2v394/jadevevavenudotaxirebisid.pdf
    • https://rajakeempat.com/contents//files/53096032211.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/45309eeb5e977710f8fb8d2e2106d53e/17846183077.pdf
    • http://bright-mineral.com/uploadfile/file/2021052906334684.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014add.bin
0257b600be113a1f237207eaa665ae747cbd4b88d3d3c009d07c27b082f5ccc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADD 18264 bytes
font_01_sfnt_off000179b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179B1 16792 bytes
font_02_sfnt_off000191c8.bin
3080327121860bacbec660dd4af0a7173486c1dfe0c8b471d0c5692bba05fa5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x191C8 10416 bytes

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