Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac464e4da34f0fe3…

MALICIOUS

PDF

74.5 KB Created: 2021-07-08 12:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cbc2632cd2357db0084a3f5c6431b0d2 SHA-1: c4f044eb82e310d0b9fe7f8f638321ede1a84e9c SHA-256: ac464e4da34f0fe30f48ce0d3939cb3cd2e3f7ad7fbdfbb5dcb37e8d60e50ca7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=the+falcon+and+the+winter+soldier+season+1+123movies PDF link annotation
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/nodekji5snk8e5qmpdh8ib1m7q/6438860728.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/nelivolakelepusekode.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae5fb947a---89875359476.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9210e872db---34817797981.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/9dn50phf09jiv2k18kv9os71st/betoxumepewarefu.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/15828329845.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/boqglbigcvmh851odi34n69q5h/24239067120.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/rerobubujav.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/fc5484f7507d76dd7cf9ec28b263ecf9/47553094068.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/fobavozafovosu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abcdfbe7cc9---80000168136.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/liwif.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c522811560f0c474358f44c57746f957/reroxorisufudoremawow.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d6dd0998d---30073758579.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff9b6623b---4629832626.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ccmrargtk581ev0stii21ro3c3/kifamovatosexuzilubovol.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/668a427ddeda9bd1ccb3a8363c2a6f85/jemepupejuza.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bltue2rqtcbeojai7cupl0red3/15779887021.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/76417346914.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160811237bd70d---73085860363.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/a255gmkel5ags1pkrgnj0q91gu/51022089547.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/89144107949.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1d4eba57a---18056795665.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608626e3278dc---84230070357.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_off0000bf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 16432 bytes
SHA-256: eab69af8d8e1a15cabc531f9e25f4e7e3ab61fe1488ce20bb2cad329e45ce9eb
font_02_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 11200 bytes
SHA-256: 7626b8e312093d95bc30a3107c7426d36f0331a9b4b3e9837466fdcd095f1755