Malicious PDF — malware analysis report

Static analysis result for SHA-256 8915079e2f2861cb…

MALICIOUS

PDF

69.0 KB Created: 2021-06-24 04:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20c9bb68301715e1918802f66ce3e2a3 SHA-1: 32249d9ffb998669e21300f25de85b100799ed0e SHA-256: 8915079e2f2861cb211f9ff4fda9b875d8a522f6179a6bbb35a0d714e1a51b24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations. The presence of embedded URLs and the PDF structure suggest it is designed to exploit users by leading them to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b081c0e5351e1bcec6f48d057820b14d/44230132036.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/969abec2f311ce9efbd87e48b2031209/43507037675.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/eaa62690a376e48df9336b4ebd0b5768/bupekonadiwo.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6dc4cee61---vanuvemotalabos.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939fa09bb3f---56624374447.pdf
    • https://nikosdimos.gr/userfiles/file/98123622168.pdf
    • https://bhsbeacon.com/FCKeditor/file/8982197707.pdf
    • https://robert-zauer.cz/userfiles/file/88882646300.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/beb4fbab440ef7a839ff99768b081d71/wezuzepazadifilowudowagoj.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607907f93b6da---kuziwimobozavutonob.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b72525705---51351104727.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7423b744d884701f5d052b2a31b5859b/sazazugiwaw.pdf
    • http://dermalab.pl/userfiles/file/72334416675.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/87afb7176b3e4b281aee163a4f821977/33505557932.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b71a3d86---88516250805.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790a6abab76---58119935485.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sam+pdf+online
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf5e.bin
bc8f74285536c0ea46e8c0ee6985a2d55843667e9676f5652186afdb3ab364ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5E 5016 bytes
font_01_sfnt_off0000e063.bin
0b032622c60217295e376f1a3308c80ae39a86008ff68ff96cbf93ae540d7199
pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 11140 bytes