Malicious PDF — malware analysis report

Static analysis result for SHA-256 feead70399e5df2b…

MALICIOUS

PDF

103.8 KB Created: 2021-07-12 17:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b09b1ba3bc8e7cdf54ef0f686a83d3ed SHA-1: 0d285894a43909fca6c365c8697f22b1d799860e SHA-256: feead70399e5df2b2853db1d848d6f72e52efd03a9f2fd294374fbbdef7823dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains or using compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to facilitate the malicious links.

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 http://apexnepaltravel.com/userfiles/file/fagadixikupotipifi.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5911c0b2f---jogamem.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc4594e1a3---vuvanumipurerilozixixu.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/34218f5917bae326c0772e3b7cf17c01/fisilavopidesasin.pdf
    • https://amursvoidom.ru/media/files/41295884390.pdf
    • http://ahxxzx.com/userfiles/202105/file/dudurizavi.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b087d3320f7---rasirugibefa.pdf
    • https://atphp.ch/userfiles/file/96439512312.pdf
    • http://webinside.pl/userfiles/file/59719322374.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e8f89c343bcdfaeaa0b019919072da17/66611882418.pdf
    • https://gkia.org/kingkong/userfiles/files/79951813356.pdf
    • https://begili.com/uploads/image/files/kunagademasepugave.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ujcuotfu2k39qqprn75h9e395t/zepixi.pdf
    • https://audit-advisers.com/userfiles/file/sawifuwibafozitixu.pdf
    • https://farmstead.tw/farmstead/upload/files/77116927149.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/eb348b7d7a32b63ce6c9b7dac07638b7/20204575474.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7192729e6f---98638193272.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fca7f99772---32510291329.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/532b82ccdc0c1a651a38ffed041d6c0e/7421188908.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accfaaae4d9---82071515933.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609121832dc16---66594609989.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01192964ca---gewozidafowumab.pdf
    • http://accessprecision.com/userfiles/file/37873921441.pdf
    • https://walkandsmile.com/userfiles/file/zabibe.pdf
    • http://kursadowicz.pl/Upload/file/46059368058.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=psychology+is+the+science+of+human+behaviour
    • 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_off00013104.bin
c2f618575aa29c3ac1b20508b7950e8b6eaf3c33bf35c7e62f82827ba09c4c64
pdf-font-stream PDF embedded font (sfnt) at offset 0x13104 17752 bytes
font_01_sfnt_off00015f2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2D 16792 bytes
font_02_sfnt_off00017744.bin
f025364b83eaacbd6b1bad5efa997d0af29620e3907af554ab0583c484c08e1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x17744 11204 bytes