Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cc41ce951ebcc1…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 23:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee312358313ba9802fdc73fb4e9043a4 SHA-1: 29353905d37678e8a76c8acc9d8fd54206f047d5 SHA-256: f1cc41ce951ebcc165d51b619de4f25a69ca5d0832f026f1a24c3adbaab5bb30
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=wicca+for+beginners+thea+sabin+pdf PDF link annotation
    • http://csc0731.com/userfiles/file/20210718014102_50yof6.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/62047cbe6927b73254056f1de676dc2a/85860038145.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/pigapuguxuxa.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/23243678946.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/27590826819.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/51497083310.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/xokomej.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd5d29af78---kunarekipejefimeroniv.pdfIn PDF document text
    • http://mega.kz/media/upload/files/18809632766.pdfIn PDF document text
    • http://axwelindia.com/uploads/57164022758.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/57521949962.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/xovalatoxetekase.pdfIn PDF document text
    • http://indemo.pl/Image/files/roxezudekunivilej.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/42030671523.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/862ac5fd1342ca49d4631dac9fa36efa/24692894165.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2623e328---90875260079.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703f0bc5f1a---64351991669.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/19511589399.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/49155769715.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/30423517770.pdfIn PDF document text
    • http://poorclarescork.ie/images/7802625017.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/jiseviz.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076b21a3b850---18245408096.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/61d0352f4f0f3b84a11949a6750c8593/52894179158.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1427e6ef66---sugomuzenopixolirewopa.pdfIn PDF document text
    • 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_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 10988 bytes
SHA-256: e8e314d7aaf2b12bad68e702f1942f36354bebd833b60980f738d69ed04e989a
font_01_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 18220 bytes
SHA-256: a75eb48c52d6abbe0de855d2c4e2992be9d2464a89c702fd77afb5f4e47c8304

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