Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1cdfdd36b9ec30…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 23:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fdd76aa497958a942ba57a6d232b070a SHA-1: 23fe452c6b0171fa8a5b3c055e0d38eac0fe6432 SHA-256: 4c1cdfdd36b9ec30fbcaabaf48604a424f159d26b2825bd115d2393a5bc5fbe9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://4seasonstours.in/userfiles/file/27089033660.pdf In PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/ab3047a7d5f3164cb76611b3b6838a6d/50795233186.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ccaea855e---41281422023.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/tv0d7t88l9rj30f3r096lbs873/bosakowavidufagirenolanug.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/zulevoxabaxebolojexizeko.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/beb4b37c2f82afffc67bdcdf7f2c8142/kaxijokaxoxiwujodexobo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/92689ea71d5b1af891c659f97589076e/nuket.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b17c0199f---81235514201.pdfIn PDF document text
    • http://skomi.ru/img/files/file/julifatewoduxis.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106292137487280.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kj9d6o2r04jcsgm8hob3mv2a24/97069576588.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e028091333---15716077554.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/65823555045.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/73562310803.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/fewuke.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/umt5m21ufb4ia0e75jq244q0sg/zabetaxabu.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/febusurezexivozop.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4226837c8---jurujanoge.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a433d4cbb04---35005727404.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/2066521009.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/24132187699.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/kozezuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kitten+is+cryingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 17064 bytes
SHA-256: ace1dce2f7b8ffdd19d9a994fda5ba2d1f7f2466f1a44a61f7aaf7c76ebc415e
font_02_sfnt_off00013700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13700 10184 bytes
SHA-256: 173e5704431c59c7d5f341a92651896f9a728f549457a83b7063254bdde2ec4a