Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d38eeb85a7dabea…

MALICIOUS

PDF

98.0 KB Created: 2021-07-05 01:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d92688f08c22f20ff0b903db4a14d07d SHA-1: f47c8438d870c711a65a43bec835bc4e43cbca3c SHA-256: 5d38eeb85a7dabea4a55b1277135ed01f00e1ac19c907a1855f51a4f65be260b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, likely intended to host and distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93bf5cb60---katutogeguzatir.pdf In PDF document text
    • http://learnazia.com/fck/imagesfile/55206300975.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/91549118098.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f061de230c---mubikitadove.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/981279797be5fe0e0b04b36ce8fb47c1/22658103987.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608009835dc21---fafuxulerarorudikiwis.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/mopadekada.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608faec8ba79f---namiwolawomowizi.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/goxum.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1fd3c014---25737979444.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c217b7ce---lesabo.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/936b0c6508a0a9957e9949a23c8e5050/30331040149.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/zafunob.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/wiguwufotuwiw.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/dugatapabapadelebad.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/gosiwoxekiwopagobupexuka.pdfIn PDF document text
    • https://latework.cz/soubory/gutanafebewotedar.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/162836575.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/f604575f82808b2efbae01687d767c6b/70945465997.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094db5c55014---borapoxaxubivasidonejisa.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/732d35be4c1a83dbba7c94b871e718b3/19171086818.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d513eed7bb---45342095899.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/95005319523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=terrestrial+tamil+meaningPDF 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

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
stream_003_off0000f74a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF74A 19428 bytes
SHA-256: e3c143a831f4ab50122b977855ebeb4e62cb8c0f2583ca7007af8c5e22fecc8b
font_00_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 10292 bytes
SHA-256: 18e1b63d63f236e457f7d319ef2254c6ce5344a35c1bd0bba9beebf0d2bfcd87
font_02_sfnt_off000117c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 3952 bytes
SHA-256: 552ec54999c4a7dee72e49f4786ef3ef7fa93902b2ba22441090637bce0f5456
font_03_sfnt_off00012692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA4 24852 bytes
SHA-256: b377384b77cd3b54ce8e95bd41f327aa45187b22f85ac3b1fa84ce23324efcc1

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