Malicious PDF — malware analysis report

Static analysis result for SHA-256 95379cd3f0963ddc…

MALICIOUS

PDF

93.1 KB Created: 2021-07-22 18:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c6e10314ded4b2eaf2a3d691b7c40e6 SHA-1: 46928bedcac4bd058722a00c08e7dbf0c9063209 SHA-256: 95379cd3f0963ddcd2f20b4d2981e0b32d70f8686667bcf76f181d45e5f7a9b0
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf10485f63---34079741430.pdf In PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/79537076636.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/19143859846.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210714144803.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/11c842588fc91ce9256ab1cbdb559d54/25077515891.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-28/20210628005411317819.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/19909598608.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mjtgopf9bs09tqmgv4hl8pvrso/jilinapam.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ktaahhfv5ni3oand3f478isie3/nimaxalarawobifakawa.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37f4da5f9---lezinajajelolijinodabufe.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/82589242198.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/lavoturomadeser.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/pidiri.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/82566590535.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/lalaru.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/gokefazowifiwutumevi.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/bizifidexovewotomov.pdfIn PDF document text
    • http://haphadoor.com/upload/files/62853612277.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/24619218306.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/joliwep.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f724a652785---1142412670.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/26575896909.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609870e1d3c93---32533930122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=swelling+and+numbness+in+handsPDF 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_off00010b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B55 10780 bytes
SHA-256: 70f221651c1f1cd84d673050f202d5207f80aa62238829ad26275fe185a54854
font_01_sfnt_off000123c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD2 16608 bytes
SHA-256: aac5c57186cd9ff63882341a3f9fb6bc518187359602614e76e285456110ecf7

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