Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba914c144eded92a…

MALICIOUS

PDF

93.9 KB Created: 2021-06-30 03:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4307759f2959600bf1407cca7a04265c SHA-1: e38319d751ac1189fde680ec1ce450695e510d9c SHA-256: ba914c144eded92a894f83f5d2c1d52aa6165ab7bbeab20d1dae4fa8429f6f91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://infrive.ru/uplcv?utm_term=new+education+policy+2021+pdf
    • http://cjandjunemillerfarm.com/clients/75830/File/vuverareladeburedibugad.pdf
    • https://adepotcustom.com/UploadFiles/file/20210509081517167.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e7d73825c---42544855307.pdf
    • http://zxsolar.com/d/files/nitep.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a83bf6297f6---91354222977.pdf
    • http://shriadinathbank.com/uploads/tarabanuxotobofe.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/2c93e53063b14a0599193d8aa4aefa83/98837233110.pdf
    • http://watthaistuttgart.de/userfiles/file/miliwivodevopi.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e2f0d77f894acdafc2d14c38cabc1f6c/tebizizibesiboz.pdf
    • http://aaaexpressac.com/userfiles/file/54645841552.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fe4e6179d---niporuledokuzojulukupi.pdf
    • http://nw-line.ru/generic/uploaded/mabekenu.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a775196fa7---59555485530.pdf
    • http://didaconcept.com/admin/fckeditor/file/dogarinudokamopiziraf.pdf
    • http://jp-photo.cz/soubory/files/17987975092.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160862ee3a9262---15813687314.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/e17ee5fcb6cc96580d8da2906d8579f6/43791375805.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/74641668055.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4cfc8ec4---44749298714.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160da1b7ccd82a---pazobumewudojapawije.pdf
    • http://bronia.org/userfiles/file/lakexoluluxid.pdf
    • https://ludifrance.fr/userfiles/file/bebanozuvatemovifozexobud.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0aa38baf3e---65303084580.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736a595ebcb---45686362933.pdf
    • 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_off000109d5.bin
705bc0264b5be335dbbd1a012ab8efa026188d470c92a1f3c285d0bb3c464cc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 17776 bytes
font_01_sfnt_off000138ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138EC 16792 bytes
font_02_sfnt_off00015103.bin
1407aa40719ec16fd5d213e0eb7d1b028b07f71df969c1f9f4682fd50f72b2ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x15103 10916 bytes