Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dd2390347cb1a1…

MALICIOUS

PDF

76.4 KB Created: 2021-06-09 18:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d5dfd2b89a4c45ff5661ef613897e280 SHA-1: a76836cc02d05872e62ad3c11b5c3c5318328b3a SHA-256: c9dd2390347cb1a1ac5821b65eede470e33ce5c06196b33c57ad01cff044a591
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=phone+ringtones+telugu+songs+download PDF link annotation
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/0b58492117216fd73e4d631df8c18398/76458064913.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/33418809531.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c56bb98bd9e551e62ee6503dacc7efa0/pokalunuligedason.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc924093c7---dofixamisobinix.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/28373229015e310a1ef77352a2e5ad9b/94357511960.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/56915688786.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf7ec9f60---luxepututumi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a813ccc90e4---wexomutepugepimul.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8ccaae743a1021b069542855cde798ee/50435059342.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/97854469149.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/6g8sa2rtlikjd9esqo1p8csq64/supesoxupugibeso.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/mivebozegejerolozidegame.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/244007aafd83ba143442a35d993466f2/daloxagime.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/54766369871.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0fbe8bd6bf2fc4d305c66aaef24d984a/kinojadekepivemi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a598a1f37d3---4137850074.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4428191af---23815907217.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 5180 bytes
SHA-256: 83563677ae2bfd1642fa33ce9d017819af343636cd65213099dfc205c94af458
font_01_sfnt_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 10228 bytes
SHA-256: d4820ac03be3789851a18c38a8ce0d7b68458c408a90989ae048eef3c592c01b