Malicious PDF — malware analysis report

Static analysis result for SHA-256 791910c2d451a235…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 04:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5455a38758030693212a0cfb275ba80b SHA-1: b253c9fbf0950add13db8bf6727e6062b3bdddc7 SHA-256: 791910c2d451a23582f039b646a2255318e178868daf22f88d8aeea9806b44fc
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites hosting other PDF files. These links likely serve to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://kltccompany.com/ckfinder/userfiles/files/60363600706.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/837b7e4e30894776bc3350637c31b7eb/dumiwen.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/34508866695.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/52955461073.pdfIn PDF document text
    • http://effektfilm.de/files/file/26162928823.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/renamudosux.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/42930191472.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1207595205611890cc25935.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/99547033804.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/gqscgevj9tuderqc2n2snmmlg5/webixapamuni.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/vinoxeganirojix.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/woxapevafe.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-1/20210701013158891275.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/nimapezagotasebef.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a75990965f1f385c103922a312f6fd9d/94912853497.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/57164522264.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/3993277428.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/2ad0f3868d3912bef190402684b34d52/3840600244.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/44539620089.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/nufilugosumopo.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/ladozefigepuvisalarap.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/911015fc583567e29f13b3d078e7f472/63976406100.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c84e1ea1cb5---jigune.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ead18595c1---duberatirofibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fifa+20+obb+and+apk+downloadPDF 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_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 17652 bytes
SHA-256: 954271416ba7dd55d8ea2b2f9577c9aaf262b4c6e5a86ba0927d13ba7e2c13b1
font_02_sfnt_off000120d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D8 10532 bytes
SHA-256: 3c086bcf8ab7fb3d5093147f8ff2c6b45b590cb9cbce66fe01e026513fd13c62

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