Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec437025a7a6925…

MALICIOUS

PDF

90.1 KB Created: 2021-07-05 07:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b5caddf9feecb9846b4fbff0fda8d2a SHA-1: 350ca1d85ece1b1b0734fac532cf3e3705f7ddcd SHA-256: 6ec437025a7a69255099c41aae6d612256b453bba01e75cf61eba36523540dd0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, specifically WordPress. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function seems to be acting as a link farm to distribute malicious content or phish users, leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adba66bde1---semimozuwogozixajibu.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608349d89773b---82256458867.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5f2e51d40463156888f08d667885fe8c/65114345572.pdf
    • http://gleneaglehoa.org/images/file/nitafadibo.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076cff550364---zitotuxuzida.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/cc7d6450272cba9b5efc4ee18b09ac70/39864570770.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/7122295755.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/43d2d2e1539ff3284920b5beb15742c2/kamolumikav.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/pqse7o9mrnhvr3hts27jc1p8cd/54123018013.pdf
    • http://toyotaquangninh.org/data/dulieu/files/16699408237.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf5a2f175e---xusodawogumivuwajomuzew.pdf
    • http://ashioke.com/images/library/File/65996409691.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4ad808d9e---paxikafasawetituk.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/46bda75kn8ndpe9hjupo1mgbp5/65426127716.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c37138020ec---80131690815.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a7026c6d2bbeb4bfda94da49c5422852/35138258160.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1knu5olejh3ghs0phnjpvjea93/jekutogufekemikejudunu.pdf
    • http://forter.vn/hinhanh/file/dikoluzisezorovitavelibu.pdf
    • http://albino-pitti.com/pub_img/file/luxinegigavizojanezag.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607753dbb9724---20893541140.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a15858358ef---92808008005.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3c550536---63870057547.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd8e9b407---11676020443.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ways+to+boost+self+confidence
    • 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_off0000fe5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 16792 bytes
font_01_sfnt_off00011675.bin
4d47e03232bc92502a1e3cf89b0e0ea8b2ba702fa707a01626c399136798b875
pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 10616 bytes
font_02_sfnt_off00012ee6.bin
3faa712c6e0727da76381f06c4f3551f03c9fc56be5dbbe86cb23adb96152b52
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE6 17400 bytes