Malicious PDF — malware analysis report

Static analysis result for SHA-256 926be67819c01c52…

MALICIOUS

PDF

88.6 KB Created: 2021-07-25 03:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f6a906a98479bb5e6b2d8df5aef6701 SHA-1: 4916b739d524a9c1af23936ec14a2e942829dfdc SHA-256: 926be67819c01c52f13f0f8b57a0242a0da3038f151d8798bb459c377630cfc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bulk-supplies.com/userfiles/file/vebib.pdf In PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/4dkq9m8tp41v45vtbhvvmb7jpk/rubusinabo.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/69800093119.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/rilikinamatobinagege.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pewipomivu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/hd7tvi3cgi42mm25ftefg03kgr/waginajotij.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/51498180033.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/vogumawavabefo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5ceca6c0ba3437eaf39e554c0864e5f8/lelotezedunixirikuperevuv.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ethqpgebqdfvj2h7arc6saed7m/76723135315.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rcp5thnqg1iroern6ft7jaf675/bosewipezumim.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/83654308649.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/wolebefevi.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080617dab039---mifilu.pdfIn PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/53720812732.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/getezixumakixewilonak.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/86385111614.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16095479d5832c---7826308293.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe66a0ff55e3bca796dada2230748553/mogufifavegilonokev.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/de842c4b073d4d9e64043e8959b352a4/fasilivezamakofe.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/19014528805.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/505bb708c3e4a189f3596c5302b2e4e1/31887542948.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074bbec48b5d---davugotowirinusepezo.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/28243510687.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae459e53f---fofunimusubepasesidod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=someone+named+eva+full+book+pdfPDF link annotation
    • 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_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 16840 bytes
SHA-256: b3dbb6cb0fe3d02d6f77178b596c58beec3b4e134d0a3eeb74a376b60e732fa3
font_01_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 10676 bytes
SHA-256: 716277952a6a5a9218caab59c70bc6ea39dc7e99c252f88c1890f694cd168a53
font_02_sfnt_off00013cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1