Malicious PDF — malware analysis report

Static analysis result for SHA-256 7739cf943a2d8fd5…

MALICIOUS

PDF

79.7 KB Created: 2021-07-10 00:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4a4f207664b90d591c3116206af70ea5 SHA-1: 094cbc2270421ece8b772015de65d76f5f2bdd02 SHA-256: 7739cf943a2d8fd5ac583a6f70e15ded4176c96b1c9f1891436344501cc10dd5
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 and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=what+do+mud+snakes+eat PDF link annotation
    • http://fmi.lu/userfiles/files/fukuvuwifetavut.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c569f5c556---87630442995.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/vapojopofenuvebuwetil.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/7g2g4ecgkndbvfumtpek2b1i82/46538382719.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/65a6a9a09fb84d125cb035e869a348a8/wazigijupulixurobu.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/37702134475.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ba6773c332982d7d7ff4a5a785dac358/5873471357.pdfIn PDF document text
    • https://nic-n-nate.com/files/files/kodezisoreworewizemojib.pdfIn PDF document text
    • http://01host.ru/userfiles/files/jokupakurapi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430145612410720.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073703005b75---91510599899.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/sexudununujut.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/21186981134.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738f754e6eb---xusejijutugesow.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/ligifalowokatavaziw.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/zumepamepamivufosobozi.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/porore.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/229aa876fbd625f68ef5012cb8ebdb2d/zajemiluzutup.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c0eb61211---40710628058.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/zifinebiwimo.pdfIn PDF document text
    • https://maturana.cl/upload/file/zupugoxulazire.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 10460 bytes
SHA-256: 0d2bbc472ab33fd2571aa0a9160c2f6c8ddaca5974bfe541c30e747bb18ec96f
font_02_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 17060 bytes
SHA-256: 2e1bd9610dd54df9212e8fa4defe4f28574896ae7cef2714c905a72048174882

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