Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c8125cb73d2d67…

MALICIOUS

PDF

71.8 KB Created: 2021-06-07 00:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9bfee831601693a39d2d65281ad62f0d SHA-1: 9129748fbfedfe9de6b9c1b9c77191cec96cd1a5 SHA-256: 40c8125cb73d2d67a6fc109dbe5f31eb2b5bdc1bd556c81ac171e864da3a2128
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://drafthe.ru/uplcv?utm_term=libro+lengua+1+eso+santillana PDF link annotation
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081544944026---92892124463.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/0misbsd8scgl96o3b1ib3aj8p3/lebozaxovuz.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/61832377906.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfec5e20f1---23061072560.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/990fbc81f2854f5f1023a39fceffceda/98872794929.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a9b3118c---34054229218.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/43d9b94db0c1f501f0025299e51f955b/38242569668.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f491236e43---xatanatu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607939a715149---jixalabo.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/kosatepizinavazi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad587167c29---54741946872.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0130445001619955986.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b832c8af4---89763218993.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b56d0181f3f---3528647080.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092e63407524---matixidagadej.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b186b250db2---kerolidod.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/dctnq2hhdduvg3i8jukiramd02/76653069520.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099e35110a3b---2314820046.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 3056 bytes
SHA-256: 383de28b9aa3baae7e761585a69e6fa3fa7bb7dcabd0abc505436b5e94e2cca3
font_01_sfnt_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 4984 bytes
SHA-256: 482b5963c4e5d7034ecd1f177a5b599ca1b56ceea0bebfddb0c09ed025c0e0b7
font_02_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 11072 bytes
SHA-256: 8ddbcebbdb1061bc458401a68eeb53f1d8bbecb111be491c424476a073d50c04

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