Malicious PDF — malware analysis report

Static analysis result for SHA-256 01316726fc8b5c2a…

MALICIOUS

PDF

68.1 KB Created: 2021-09-15 20:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec2bc1df3133ad9f8d1e807a65945ae5 SHA-1: 668ffd460ce198070bc0e1bb9cf9c2a3b214d0d7 SHA-256: 01316726fc8b5c2a5ff8d36a62118bb63ac292e926cb86402a1c4bac425ecd2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=movie+tv+apk
    • http://richmore.kr/uploadfile/fckeditor/file/julapawatutex.pdf
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/nadabemu.pdf
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/68510765022.pdf
    • https://natanashoes.com/kingkong/userfiles/files/tabomusomafivojorajaro.pdf
    • http://bnblspecialities.com/userfiles/files/46057902681.pdf
    • http://fsgpj.com/upfolder/e/files/20210908031339.pdf
    • http://classtool.info/upload/files/rivam.pdf
    • http://duet-czluchow.pl/userfiles/file/15928249126.pdf
    • http://diagnosticaedilizia.com/userfiles/files/56440065455.pdf
    • http://ausafe.net/images/art/files/towodad.pdf
    • http://kfnmsz.com/upfolder/e/files/20210910205031.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/93b9g74l0ud7n9d2a33f5r1gfi/63071889000.pdf
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/57715205641.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/28648899577.pdf
    • http://wienbildarchiv.com/upload_files/files/niguriwugawetunilivedod.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140972580cca---pejenojuniluwivedokuzar.pdf
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/movatikuxapafivow.pdf
    • http://zoekidsworld.com/userfiles/file/dovujitobavijumisulit.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/31110504207.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/saruzap.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d75d0668---tovawuneg.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419d81bb826---kiralokezemazatojajonijis.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5d9dc7fe955fbbf9edf6a06839f06e1d/85139423376.pdf
    • http://jandenzobv.com/image_uploads/file/40406733852.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_off0000b0f7.bin
c4722548a99d883a73933a7fd73d3382ce028bc44b7e1a38e41aa0d2b850d6b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F7 9976 bytes
font_01_sfnt_off0000c748.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC748 16792 bytes
font_02_sfnt_off0000df5a.bin
dc6e5844eb26eebc1476c6120e1b9911f8cef74c252c3d6ec3d2fcb594eec935
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 14424 bytes