Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bff9daeccd15aa…

MALICIOUS

PDF

77.0 KB Created: 2021-08-28 06:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2f2e88a536abfc0bf78bba38be3a196 SHA-1: 777caaddafab898c55434cd78825e44b260114cf SHA-256: 51bff9daeccd15aadeed0033e83071d4d2e6c9d4bc8b1bc679871281625f0120
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/40131554690.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb4e1cc75c---tutakusakixik.pdf
    • https://progin.ch/ckfinder/userfiles/files/wofitopawilaxidavepusofi.pdf
    • http://alnoorcity.com/userfiles/file/tisoxigufadibewivezur.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2a974683f5a0ecc345590b0a6c35152d/dilowonigafanapibumuko.pdf
    • http://turexpert.md/userfiles/images/file/sodafarofekivomidewi.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a27ca9a844a---zeretowupazu.pdf
    • http://sobinco.cz/ckfinder/userfiles/files/18318193803.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd3472996e---54020473662.pdf
    • https://unitytradefze.com/ckfinder/userfiles/files/51307470923.pdf
    • http://cc-loges.com/uploads/file/74869427072.pdf
    • https://aduanaldelvalle.com/userfiles/file/nejetuvolitizes.pdf
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/21485929029.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161098732116db---11709135585.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608a907b541af---juvajobujokog.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/tadudu.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/58816603201.pdf
    • http://nova-auto.com/upload/ziredasawafivenumemegu.pdf
    • http://www.iece.in/userfiles/file/wuroworixaxuf.pdf
    • http://kuzfarm.ru/images/file/70114538509.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16121672032ea1---biwumitesubumonepanubefi.pdf
    • http://capitaldanceacademy.com/userfiles/files/21613894109.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/52pipfs3j6fgp4l3f0caso31o0/42047764694.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8a83c64c2---96356397555.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/4b3540fc69b21e88e57b26c4ddd6d4b3/47921336556.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=solomons+12th+edition+solutions
    • 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_off0000c957.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC957 16792 bytes
font_01_sfnt_off0000e16e.bin
72c94cf4e950187cdfb2b295c30989f9eaad2872b5e78aca41bed2e552d2a8aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 10600 bytes
font_02_sfnt_off0000f977.bin
343211e70eaa76c53ab556d97956acd55bc2de71183008a803c8899c38513994
pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 16964 bytes