Malicious PDF — malware analysis report

Static analysis result for SHA-256 2491cbf87f9935a1…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 16:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 926fb535409e3749562fdc92abb76b35 SHA-1: 7e04da9ed5f5554bf6f3b93abfdaaa8ab9deafa9 SHA-256: 2491cbf87f9935a14e85b09f925768b554fda1929e88251ac0987a14474d57a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the primary attack pattern involves luring users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=practical+byzantine+fault+tolerance+pdf PDF link annotation
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608388361b5bc---jewezeduvaxuzinimira.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ziropixujefawedekuxosixog.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611221ad3f9fb---10313286583.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/worepodipetefup.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/86738273830.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/siwusiledaluk.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160870fb8de8d1---14593451532.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/21021616294.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/09a01f9af051db4c84484b6142f56c04/205301784.pdfIn PDF document text
    • http://fitviewer.biz/files/file/zaloxim.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c101858ae07---naweg.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9754199f261be0907b3cb96681ba7f2d/paripesozefurisutazawujav.pdfIn PDF document text
    • https://promtong.com/promtong/temp/file/suropivadovojalagukiba.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/toleleduditabigewos.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/wibifosugukuvonejutado.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7479165346---25785307898.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083cab81e4ee---zumetibakefodurugebalufa.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/bepogisatupamis.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/tutuzo.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dcfa79c34---nowivokuweta.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/fakobedigujapejupexunome.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ku8huf76kvobi8kb25llcli3h3/15069817133.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/17837961618.pdfIn 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://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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 17768 bytes
SHA-256: 8ea6e0887ca4d8673e4b2c4c0f4c348ebe9d88587ec8c62575666fd0cd8f9509
font_02_sfnt_off0001212b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 10860 bytes
SHA-256: 3b07ecb818b2e43d3ffad19b851e79197c9abf15df879d7606c6782fc177341f

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