Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04fd44622d916cd…

MALICIOUS

PDF

80.6 KB Created: 2021-07-13 23:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fe9aa81f915f5e2855c13280e810271 SHA-1: 5a0ac94570ad92be5f88ac47daaa5a4eb9a06a77 SHA-256: a04fd44622d916cd2e456c3940e986edd01f7d0555a86c1d1de0aad192255af1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crysiq.ru/uplcv?utm_term=play+stick+war+2+hacked
    • https://smaransaving.com.np/ckfinder/userfiles/files/wewunopolosot.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fc1fcff2e---84133015594.pdf
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/79970513779.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/c3pa3hpnnonpr4tu4vgndcqp88/jumolalarom.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/27957437816.pdf
    • http://studioagm.it/userfiles/files/37507957633.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4d3001587---31789438542.pdf
    • http://architects-desk.com/uploadsfile/pomejawinunaritoxe.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/aa5trok8d6nculdepunujb4531/duvuwubodupi.pdf
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/kazadig.pdf
    • http://glotecgh.com/upload/editor/file/15154160775.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d053ac5a5e1---vodararabudiranedopasokem.pdf
    • http://geostudio.eu/userfiles/files/fovesavuleda.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d853707ff4bee15d2abe95e027ff2426/94466005316.pdf
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/fizamigebekuvoxarosugusuf.pdf
    • http://geoplan.su/userfiles/file/darakexinilovetakopo.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7752ce9e33fae8642531ba4bcf11fe5b/78582400469.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087391df02dd---94638377258.pdf
    • http://okmarin.ru/userfiles/file/jubenuf.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/18c2523305e57e057fc84805ae528b00/57432682278.pdf
    • https://mps-india.com/userfiles/files/rarugimelilazoziju.pdf
    • http://www.conectadoscomdeus.tv/arquivos/file/jajenawabolisiwawojaroriz.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b30a9e85d---42239199347.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ed29c12e3db165794843eb7d0fb908dc/tomuzu.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/dvs0a6mtb2lsg7a5vrje5cjedl/44351888919.pdf
    • https://suma.ca/upload/editor/file/fazawadekapono.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_off0000d959.bin
edd013974542c92d8c0e4181f9af965f143eb2ae4418d6427235465358a7bd75
pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 10656 bytes
font_01_sfnt_off0000f20d.bin
de536a5e1555c5274cabeb5723e9cac1ce67a31fb38a0cb491df6207a9d08009
pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 16464 bytes
font_02_sfnt_off00011ce5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 16792 bytes