Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad1b0bde17e2569…

MALICIOUS

PDF

106.8 KB Created: 2021-08-04 19:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 414e4cc993aea6f8e7c0fefdc3e7f0f3 SHA-1: 2f604de2214be6d37c85f9d2997b1253b07d5ed7 SHA-256: 4ad1b0bde17e25692d621248f881b00d468d3b230f49c969e48434bc2b557a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve to distribute phishing content or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d9ac0dcf---46226971301.pdf In PDF document text
    • http://alexhoffordphotography.com/temp/files/file/63727702927.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd844a0cc6---71474517274.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/74945456596.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/fde273fb104ad8dceb1e8a867175a7bd/41060072095.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/87226791455.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7c6620f2---buzukuzobuwekinupinokades.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/3695737683.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/duxabemimavokadokulewak.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/5521859241.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/nivuvajalikiwuzezumid.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba56de734cc---fefemivinerewig.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/61cc09db9761841ac2f2481d5c8f237c/natubotisigeg.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/20743283213.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///gawidogumipinubunolid.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074477638d8b---7652918336.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/tozoduriluselanowofatew.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/etcumu2457qnk3dk16bu4ss83o/19572466734.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/xevomudilawesogoguguwus.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/jevuxopetuxapi.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/gakabumixekekafekada.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/97464bf66d8495f40544b0d0ff0a52df/70701446870.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f975cab3---80693703745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+are+the+characteristics+of+renaissance+music+brainlyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 14744 bytes
SHA-256: 98976379dc7ea6aba36bd9d569fa1525c7252e98c11c6269e588f7e378fef9a2
font_01_sfnt_off00013908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001511f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1511F 10948 bytes
SHA-256: b500d943eeabeef7be546d598c4a3511df71ee0ed21aa49b309530c4870dff6b
font_03_sfnt_off00016a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A5A 19036 bytes
SHA-256: 26333d7ea568774f5bfa7e77ffd6cca96887cee77801e64c3f0c07719907751d

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