Malicious PDF — malware analysis report

Static analysis result for SHA-256 931ddcb005d6a403…

MALICIOUS

PDF

85.6 KB Created: 2021-08-08 07:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14b59c787ff7ebd21e9b48310ed30843 SHA-1: 7729fb9f4f11e55a8cab85aba72ab14a6cf82b9a SHA-256: 931ddcb005d6a40313200e487655a6354cb7e7aa0e9b83354cbc3b1b7395471e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload locations, a common tactic for hosting phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58b68e551---97622775591.pdf
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/47995351761.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/vlkn8atrnrt2avqpmg1f30q1kv/25661054021.pdf
    • http://thegioidahoacuong.com/uploads/image/files/38427993326.pdf
    • http://aeronautike.com/userfiles/file/38000637598.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b651d6d353---27771148222.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e749a2e31---76019570101.pdf
    • https://ijpdua.com/contents//files/zaruv.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794388b25df---tegefabedonulituwekex.pdf
    • http://bestorkate.com/uploads/ckeditor/files/44120183877.pdf
    • http://www.hangmandigital.com/files/file/55760429321.pdf
    • https://alteanetworks.fr/img/file/72745810037.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/7b5c5ab83ba6c6ac2227e72fc1f0ea78/vobowupile.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb78759913---fulagobuvipuxamezep.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/74498730727.pdf
    • http://candleelectricals.com/uploaded_files/userfiles/files/37077955551.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c492a57f77c---gizajawerefusomot.pdf
    • https://confetti-seasons.ru/upload/files/59978963355.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bfbc86b7844428ce7d143d893b04df70/55263611587.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac94f4638a---27184033848.pdf
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/59635678871.pdf
    • http://jjmcp.jp/userfiles/Image/file/piwukekolux.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3b8e39ea---lepugumanovot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+soft+reset+iphone+xr+when+frozen
    • 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_off0000ec1c.bin
822340a61b4b48d0b750b845e8cf590b71cb10d97322ac73bcebf60bc5348853
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 16676 bytes
font_01_sfnt_off00011786.bin
01d9b6a110d79de7341c997e218f4823fdfd2e188c36f284d4869113823e6855
pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 10488 bytes
font_02_sfnt_off00012f62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F62 16792 bytes