Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9195c30c3c922a2…

MALICIOUS

PDF

98.2 KB Created: 2021-07-01 14:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0fceeb84c580cd1573fe8ff64ce0e4c7 SHA-1: 478f7377de11d9b6fe3654ea3957d57189370e71 SHA-256: b9195c30c3c922a284d841b5edb797813869360844ae4cc0289cc10d58d5b8bd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://krisoc.ru/uplcv?utm_term=c%23+oops+concepts+with+examples+pdf PDF link annotation
    • http://ahkjt.com/upfile/file/80663202207.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/41070892272.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/f49f013f2a9b87212ea8dda8f79f6337/risokelukowi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/48477483599.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/hdrqg3l1sf6c44k3l34rck8ad5/nodemujulipopunavese.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210530_18674695CB03080E.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ukemnd01glkc4rqsd86qgn9qhh/47095978494.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2a76048c---17243344473.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/58918326319.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/75583375718.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/87c5ec5a6d5485e4b4e2b7bc42472969/87543574531.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7csh3p03spon1sab9pv7k84oa7/xezawimidiwokulesilupov.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081f08fb1af8---79692311644.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160790bd8ec21a---molarozimotiguwatupodi.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/xigutiloxijobudarox.pdfIn PDF document text
    • https://ancoraeducacion.com/images/meguku.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7af069d542e916c8c95fd623e6d014b3/zefopomovasopojosif.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095da1cbc0b2---dabufobi.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/givejupiku.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077c2256b737---55681798009.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6725b38dd---kofipotegegewe.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a026bcc580c---mimumevoromagozezid.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f36ea14207---juziravevorigomomama.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/zukexate.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 16080 bytes
SHA-256: f5f1798f98eabe8ea788bd15819605730b7ea9180b8961d2694f70a1ca904549
font_01_sfnt_off000110fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 928 bytes
SHA-256: 3c15da991b16fcc268d8d33266f0982d2616c8d8d09e4e64322fdaef7a2d7494
font_02_sfnt_off000117ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13005 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_04_sfnt_off000142d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D2 22036 bytes
SHA-256: fbef941ddf8751a608952ac5c352a19514d21b9a34e50b21d11bd086999e0d86

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