Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f4cccd73e2ab5f…

MALICIOUS

PDF

167.2 KB Created: 2021-06-25 18:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e894d53750574b12e30972304cd5181d SHA-1: 3d0d1b2e1e4485edfaf6f96818c276942e9c4c1a SHA-256: 84f4cccd73e2ab5f5724f47b9619cca0280afa9ffbafbe3b5f40630ae50f0f86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 https://smidgel.ru/uplcv?utm_term=pointers+in+c+by+yashwant+kanetkar PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982fcb421c7---jisinojefisirofizebejibo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eaa7200bd881afcfc03ae494b7b5728a/xupuxapi.pdfIn PDF document text
    • https://signika.pl/Upload/file/64972034606.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2dbf6d188dcf85c380922fe0475f65d9/78238912824.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/lofozataj.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/zuwemutidanuna.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/22582551717.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c066eac98d1---xonumewisupogose.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/38760473522.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/34475292557.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6dede94dc---tinugeribixibinikatix.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/v4msle02jsou845lv1oqlq4vho/majozanerov.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a3be65be---futowemuwajunewud.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95ccf3dde9---rutijozuruwifewu.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/73471366510.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/30c48a69e2b58defdfbd6fc7aa69b8a1/85895053093.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/94570652740.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608270d7356a2---libapefebifunevoluxuzevuk.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84199e621a---67191563147.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/57358111825.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c636d62d2f---88785899655.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/177f3ef0b32d04a3bf45d4805a62dd4f/nedojo.pdfIn PDF document text
    • 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_off00022a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A21 19508 bytes
SHA-256: 7e5e9f1bc05d99d69e4b2150b17a8f8699015faf8203e439a3943bb8e7032151
font_01_sfnt_off00025e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000276af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x276AF 10712 bytes
SHA-256: 6493ed35644607a9f500a5ba4086bc804b6d117eb9c1e4cf66f03250e41672b5

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