Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71d946e0ce7270c…

MALICIOUS

PDF

86.4 KB Created: 2021-07-02 17:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfc6f6be536ca098819826fc56a9c966 SHA-1: 6f9fd53256d2e943c3f5508775e86db80b80fcf0 SHA-256: d71d946e0ce7270c1363cd32dcccfb73640b78bf4d1984b70d39326895c9ffc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://shosholoza.de/file/91753276257.pdf
    • http://matraholding.hu/images/userfiles/files/bolazuroxutazovezodolazav.pdf
    • http://paroissedementon.fr/upload/files/laxadosapojawasizof.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0f073594---87534328401.pdf
    • https://ka-base.no/images_content/file/narasaxu.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc143eed64---wipugiwe.pdf
    • https://promtong.com/promtong/temp/file/68693145654.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/04bc5578ca394f713a1ff215845d4d97/11189217051.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/m7ubbu9i0k4850elievmalj8lj/naninidezela.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/voxiwefefumigesevopese.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/935kclm6rhtd4hsj67us2vcuh9/rakukaxesifobofosefuvek.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947b2de247b---44498695156.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a0e32caf---84323943366.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a04d271d9671adec1d3f52e680d4b53d/97591882794.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609991dfa137e---73597391500.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/841817bed59e99f6c23daf7116b0d0c3/guteradaxofonojeniba.pdf
    • http://tuttotop.com/userfiles/files/sisivifemawuliwibula.pdf
    • http://614move.com/clients/4890/File/5796099825.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/makuko.pdf
    • http://isystem.hu/ckfinder/userfiles/files/25475997323.pdf
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///2021620912466360.pdf
    • http://contactconfiance.com/files/files/sutazoper.pdf
    • http://beiks.info/public/file/94672747854.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dd91c599a---zawubofajilodixer.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc9d9d4fd3---24362708891.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609439d47bf8c---tubatozozumatu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=a+sunset+law
    • 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_off0000ef6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 16792 bytes
font_01_sfnt_off0001077d.bin
00e70c4a6f8239ca7aeda373a55e99ea68635eb044d6a8e2b09dac9ea48fd314
pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 17732 bytes
font_02_sfnt_off000134d0.bin
6ecef6571145c197246b4bf2615ccfdd57ead0b3b37bee416ec8ce6713528d1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 9956 bytes