Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1092b96e88ef190…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 06:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2f40ccf6a1f1231d30fdf0b76e1c9927 SHA-1: 39776beb688c7371c2292e5e4de56d35c504ebc8 SHA-256: a1092b96e88ef19015e81d1947058539138e870df8b14a504151b7f1cb2aaf40
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, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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 https://drafthe.ru/uplcv?utm_term=aditya+hrudayam+lyrics+in+telugu+pdf PDF link annotation
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3d22c532f023b734e83595e0ddaef8bf/44024957887.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210812_D344B3CBEDEE6093.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/fakizisul.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816fa707bbd---128545381.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9245f1f5---36245494483.pdfIn PDF document text
    • http://martonelektro.hu/files/file/xipinorevavigibobav.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kafijiketefil.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/34229216848.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed28407cfc---94567258982.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c56e0e4cd---24656862185.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/64433193668.pdfIn PDF document text
    • http://specimport.by/files/files/gogixumepavab.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/xoweziwus.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/jezulidofubem.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/tepemizurot.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/lawefakasawar.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/90011966418.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2fd8da882fd578e2c02afa8639177080/24397294716.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf4e72765---bijogugomotunuriset.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/49647589287.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/dad820b32b28d6820486899e6b6460b8/73139939959.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/kajibarum.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/losavonepilo.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/58107987513.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/zotubisevuforupefoj.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613190d8b374c---98947250867.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
stream_004_off000103a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x103A4 16668 bytes
SHA-256: 6c00ceac780d3f422ddef1c614ceb0fce5064fd832f35bc1808fe21ba17941ab
font_00_sfnt_off0000b865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB865 11144 bytes
SHA-256: cce198dc6c9f25e29cbb1183a788f8da3c1fc40f6ae41ec5bfa909e4c6384020
font_01_sfnt_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 19192 bytes
SHA-256: a26434cd5a21f3fe2b1696c9e31c94d1408d00d3ff572fb2fe97ef02ebff781b
font_03_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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