Malicious PDF — malware analysis report

Static analysis result for SHA-256 4580a7f6ec07395b…

MALICIOUS

PDF

63.6 KB Created: 2021-05-16 13:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fbb6de180bacfcba5a8db91792ad7b5 SHA-1: 05fc3f7b44a5281a28711462af9e20ed987a9c64 SHA-256: 4580a7f6ec07395be96f79f0b5ff3a9dd02e4e03e084f68ffab3cd9fafd7d6f7
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. The embedded document body text is garbled and likely obfuscated, but the presence of URLs and the heuristic firings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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
  • 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://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/gu95e8gg6q1aefvudfo91ujjg5/70950466983.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/qrgujpalffatrpd0oojss5iejm/xevekogawel.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7e7ceb6e8---rozizi.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e72e285bb---xejexos.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3382c6127---kizubuwixenuwelutuwoxilap.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd7d3473a---menazibamotaxug.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160870f52b1451---62932287308.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d0e950d4a---12336620940.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771f5d427f5---33079998666.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160768c613c545---23348851434.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098ed65e11dd---68749819058.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/bb73f5e805aaf6bcf124223027fda27d/jabirepibazavuboge.pdf
    • http://blpest.com/UserFiles/file/pegatogomezakoripipiruj.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c1182e4886b03e7122f15eff95c82bef/50226799974.pdf
    • http://asijskepotraviny.cz/files/file/vikurekizi.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/4137823f39f7afc12d2e406002a500c2/gidikof.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5c2c305664d044c9e8513a0189ecdaf3/pinabokazesako.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/74ea9f52620b3146237d363266967aab/jametidiwukezunutexebap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=video+making+software+for+android
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d933.bin
ae3414801d378db5c08b49ea55ce8223a53fee19b4f69e7b5f5b0bb55416ca05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 5316 bytes

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