Malicious PDF — malware analysis report

Static analysis result for SHA-256 2434d7866f8fa255…

MALICIOUS

PDF

73.8 KB Created: 2021-06-26 11:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4d8b08a6926b51762952a4e8ba2fd482 SHA-1: 695a949684c2fcd696a81578491a688b6a550633 SHA-256: 2434d7866f8fa25539462963de721e82d12053f3d5687eba10f5d02ab4673135
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious sites. The presence of these links and the overall classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=2300+rmb+to+usd PDF link annotation
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fccd54bea6---10460098541.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fe4cfd678d480aefc324cf47f86b3822/gitud.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/wapebuxasagewe.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160907c65ebc4a---8769584175.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609256d1d0191---11899914868.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/99016519762.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/siguvosazuvuvusax.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/095becc45592a813b67627448c1e005f/94291165865.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/rokofidowo.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4c7daea0990df55cfd2bbcee5518374b/63833339811.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6d10a4b1e4b7114ba8d596af8d5db8b1/zakupinegawuridiziwodu.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/mozadar.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb240067d---rutoxaxute.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/80220434550.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/89241311849.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/rotekigefotibenudum.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/mixumob.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fb03e0bcb88a79005298e8f9f9f2a0d9/napev.pdfIn PDF document text
    • http://panteres.com/files/files/87581236516.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/65655769740.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55f5332b09---pikoxuzetitolezemenawid.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/96e6ac21c9e47b70e5903cd213625b45/86709434308.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 1764 bytes
SHA-256: 25f153bab7c6b441bf0af0828d3e3272340631574bb0ddf5121e9364682dc2c3
font_02_sfnt_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 10428 bytes
SHA-256: deb915129b6bed7ed111610375cc75412acb15c2e2aacd40b030b20b1743083b
font_03_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 16004 bytes
SHA-256: 0d8e28228c5706bbcdb000196c518c522c0cc139f08b32fc42a904763aa48786

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