Malicious PDF — malware analysis report

Static analysis result for SHA-256 4448f6900234b286…

MALICIOUS

PDF

92.1 KB Created: 2021-07-19 04:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6c86f4f0f09f96ee15cbbcaffbef13da SHA-1: 8ffb59e0e66908e4fc99b960f8bd56ead23372c2 SHA-256: 4448f6900234b2866bf6ccb0a9bf0ee6602ebf283f6ba7a240468677c1dcaa19
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c69c10225cff286633193716854a3ece/pobiduxenowif.pdf In PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/tusebifanejepixede.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/94511434805.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/xebonimupepof.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/tozafotegoditidosep.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/98023814171.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/67262017919.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724e69af709---66526360162.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/30908748551.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/witemexa.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/96133671276.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/timosenasi.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/17553981596.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/16600522251.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/4tlrmnoouqmd6g1pbl1oklj3h6/45354789586.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430da1bab3---25605633530.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/fepixiretulup.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723a941806b---jovopaxojibi.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/94103724941.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/161401eef8cccc58a0b580cd3c9f42c3/91580008375.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/u8hdbralnb963t43b5sh34si7j/kewaxufim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=anaerobic+digestion+of+biowaste+in+developing+countries+pdfPDF 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_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 17420 bytes
SHA-256: 3f361ea121fd12b3c8c76d1af958cd43132ca958356d6903a75da81adf9782f4
font_01_sfnt_off00013100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14917 11168 bytes
SHA-256: 2b0142a106d7bcda06e848c2a7d5d9b072891c24358927ac055fde68b18e641e