Malicious PDF — malware analysis report

Static analysis result for SHA-256 208c66bdcdb4c959…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 10:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a7c0124f06812432e39836c16ec971f4 SHA-1: 7d5cc8ed2bb1b1aa2a161245453b311fab1af088 SHA-256: 208c66bdcdb4c9590e7653024bee6916d266518b4165edb0ceb28f73d8af89bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is likely used to redirect the user to malicious websites, as indicated by the numerous external URIs found. The presence of a link farm on compromised CMS upload storage further suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7513

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=corrugated+carton+box+manufacturing+process+pdf PDF link annotation
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/4397899146.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/fisib.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rkvromq8ps95trjl6uifongasf/kotivuxemat.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/73413420059.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/worisavamedobabumozokawiv.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/21091156884.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/93231584010.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a95155a768e---63700933440.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/pirugilotujosunoxopisir.pdfIn PDF document text
    • http://pronobile.com/catalog/file/62012544276.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/21640049911.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cbc0749b7---zakusekilulutaloposiwujed.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/58072826877.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/vigulefefegeva.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/redol.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d1702c175---38293362671.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5p1n97325tcpn9ci8o5vj1ldd6/komogekizedupe.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/49970680604.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/zoseze.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ef15138bc5fec3956f9b942a5150e11f/95198972257.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c226a3f2d98---19405221210.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609481be199ba---vazunosumibujibokasedinew.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/41391441109.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3pih837g2mroig6n2bvci2b74o/66510362931.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16112478aa030b---84818012536.pdfIn 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_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 11292 bytes
SHA-256: be034a19a0204ca142a1f0df3d60f8df2ab4b07af398c8b1f376ff6b3ab98515
font_02_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 17724 bytes
SHA-256: d839efa280468ab5c528e8bfd4b3132a263552b57de5bfabb2d26c4241601dfc

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