Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa21124c97f2025…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 17:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4389baa956de6598755638054df54550 SHA-1: 54173b4639a2cc88acdec70b7b74b92180bc2f2f SHA-256: 2fa21124c97f2025ad17b43b17d13fa4f632e65c98328d9be860f331e4b0f4a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://citronixdeflection.com/nbloom/fckuploads/file/zubenu.pdf In PDF document text
    • http://sgd42.ru/userfiles/file/53911278333.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/46536778286.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/febokakida.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/zaniluzepagu.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/bobabedafoxexo.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/14896046814.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2qbssa605c55plb1e4tk15her2/23810449729.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/49314571639.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/4401999818.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/13484365888.pdfIn PDF document text
    • https://chv.vn/userfiles/file/65313292935.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/divutod.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109011743098148.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/23588035442.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/85sio8io3hchofc322t3ueckmu/melunu.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/35822930812.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea247998d---vitisotedilegelerin.pdfIn PDF document text
    • http://heizler.hu/files/file/foseribom.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/noov4qb7poph1ob9oue6bfi4b0/bawewif.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/12679951032.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/7692901746.pdfIn PDF document text
    • http://futboltotal.net/images/files/22161858769.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/51475206166.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/81812449674.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/94454654282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cirilicna+tastatura+za+androidPDF 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_off0000d6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FE 19028 bytes
SHA-256: 32d65f5afa8b634f431b838e51f27e7bf50ba45ea569a73392d31223491d84e4
font_01_sfnt_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 10420 bytes
SHA-256: e9c448b4902068d8c7bc601f1bb1ea10d0eb4e55a661e51a3959caaf1a2fefa3
font_02_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1