Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda4b2ea30bc5105…

MALICIOUS

PDF

85.1 KB Created: 2021-06-29 01:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6099c65d14975b7f0d8d0cf7632b741c SHA-1: 5ac6cfc38b725a30c4a2d156fdbb434d7cd5e987 SHA-256: dda4b2ea30bc5105b86777d9d5a4dd6c723fe080ed06ce3a8921bd28905079ae
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://dishandspoonproductions.com/ckfinder/userfiles/files/19537539693.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/jonevasubumeri.pdf
    • https://cape-electronics.com/media/file/73056595037.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a556a2afab9---dojobiv.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/0i7rr8e50k49p87s1ijr449obo/4167415853.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/pal5mp1b4p6luikkkpo9a2d8t6/dexuxolekisiwik.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/6e6d5e64c0aa4143b794cbf04c3a9209/19178210794.pdf
    • https://magatek.com/documents/file/14344292922.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0a5cd2ff0---9082568987.pdf
    • http://mmckno2010.zkosuchdol.info/files/livezuguwo.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f808476497---92188537063.pdf
    • http://www.kickcommerce.com/userfiles/file/7925072643.pdf
    • http://coming-c.com/userfiles/file/96132939399.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6a523ab18215c89292b60a2790f14e40/lobazigivapafudakexipe.pdf
    • http://chroscina.com/userfiles/file/nawipatenegiginubumok.pdf
    • http://www.sport-konyv.hu/userfiles/file/bumaxirewozuvonisaki.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//60446038364.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5d97dc40abeccb6db7abcfe04671857f/kosufagira.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a96e2cd8a881e7c3fb5824465c35ba8d/42638178922.pdf
    • https://pet-fashion.ro/mm/file/28111583541.pdf
    • http://mitcostruttori.it/userfiles/files/javol.pdf
    • http://botosani.ro/img/uploads/file/sukobodosibelamomep.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd33e9d1a---pizage.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/789f939cd5007711915cf3b78ea6be28/lafovesiwap.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/6f8a0b0b50a494f87457ba6cbf4c02db/70736232154.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d09e0d4b---68892451606.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=easy+slime+without+borax
    • 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_off0000e925.bin
660047fed4b0cc7bfde2aaeda3c72ea92bef1a79fdfa5547288bb41ec51ef0b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 16676 bytes
font_01_sfnt_off0001147b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 16792 bytes
font_02_sfnt_off00012c92.bin
9c9aeffc43813c22e4d15a8374dde5e56abbefef16af5a24a55e3846355860e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 10796 bytes