Malicious PDF — malware analysis report

Static analysis result for SHA-256 5922fd53f735b6bf…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 22:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61c63b6c939db9d4484c1e820a671f54 SHA-1: a6b6c10b2932141d292d86a1628005e0e829a06b SHA-256: 5922fd53f735b6bf2f2b2c6c73b2cba4d23dc82604401dfb5d50e1bfeec967ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate phishing destination. The embedded URLs are designed to redirect users, likely to credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ketchas.ru/uplcv?utm_term=12th+science+biology+book+maharashtra+board+pdf PDF link annotation
    • http://slsnn.ru/content/files/98804460678.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/julezan.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/64725762517.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/dininuvijipo.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/77923644863.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2715d1b07---nuluwunudapizomiwajijip.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/bomozorovotijemipil.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2a56df0a---3867169694.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0fd9c05a---25418438380.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/zonetev.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075406629690---moworatorasuniv.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876500cc6e1---lenamamepisidi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/7697354015.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/18489132678.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fbaca8997ea78ede2cf444d145fdfebf/jofazukuvebipokitadol.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/rulopenapubikabel.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce0e983d3---fefigenabile.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/45634872851.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/b29749748fdfe8301fb4e2a937c9641a/31680465178.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a3c81c9eb---19886528574.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/86304309215.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/af8bf7ac8b94fdb412d2da36e94dd5fb/gukudoxirenemafe.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c6ead1c4c---bomunupupor.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/xapuduzovasazuzuwuk.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/vedijusiwa.pdfIn PDF document text
    • 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_off0000b2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D5 15688 bytes
SHA-256: 0a797ffb261a216ec3ec624ffc3b6b0180685c54b7497a50bc48626db1b82d20
font_01_sfnt_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 11488 bytes
SHA-256: 1dd6e3579116a826b21719cf04e1e27aa6ea3e92caed61b95fcaa470310554ff
font_02_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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