Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe51bae8f9ee0e2…

MALICIOUS

PDF

106.3 KB Created: 2021-07-03 03:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 266b1f79302c21216ba261ea387b83ca SHA-1: 596338f7f07f31644b66c8d2b34fdd730fd8c5d6 SHA-256: abe51bae8f9ee0e2b0a1ad130a956aa6e541882f3614106336f7a4e486bbf5dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://cructi.ru/uplcv?utm_term=infinite+limits+problems+and+solutions
    • http://urbancollab.com/userfiles/Proj_Name//files/fajudum.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/330180fa1d98264d11ad709c832ce065/39105313489.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/35s4sujqa5t05irsbu4lm8smm3/filowotimelumate.pdf
    • https://247hvac.ca/fabulous1/uploads/files/kujisulitikexilagimifeni.pdf
    • http://thedewakohchang.com/image/upload/File/8973033610.pdf
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/18901863538.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c7317766---litokise.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/51883904101.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6a140ea31---dipuwizetiselu.pdf
    • http://unsersohn.ch/images/file/79909135508.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c62822fa2ddc19e94a1592b3473893c8/rapamadodajam.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/lulasuneniwenim.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160909d6127934---wuzulefaxilomoremu.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/63960606102.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff1e983e4e---97979585670.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160770c1fcab4b---30019570712.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/glrfcbotdhb3en3akvfj0fm1nt/50278898083.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/518caa7af9eadde0f12140fd862c18ed/49868633137.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/n3kp7d1k8u03mgr0t98bhruudo/falebegaxuwego.pdf
    • https://melz-feu.ru/upload/84555390187.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/883f1b564f82c58ad72dffe67602b449/rozerusibalizovuwug.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8f2b1eeba2bf75dd1721dc05ef7b6ebe/pegazadisoxo.pdf
    • http://stlnsk.ru/uploads/file/zotazemudegukibezibawap.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb23831d52f3f7e18c3a8b7e5e14cb2a/fatisotumi.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/47777804794.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_off0001392f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1392F 16792 bytes
font_01_sfnt_off00015146.bin
3d7d12119ee1b9ad8fb1db1bda8782d0ca94f903f900a9b067a88deecbf1e151
pdf-font-stream PDF embedded font (sfnt) at offset 0x15146 10852 bytes
font_02_sfnt_off00016a07.bin
b53bc44c0587469ab6ac52c55dd104939aab35d925f2c04065f6132472bed237
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A07 18784 bytes