Malicious PDF — malware analysis report

Static analysis result for SHA-256 9218d7a961cc4a33…

MALICIOUS

PDF

80.9 KB Created: 2021-08-12 13:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0be403faa3531bd37ddb7f504f213ad3 SHA-1: ed035876a1d8fb5c9c441f0269c48bd502f4a317 SHA-256: 9218d7a961cc4a338c8d585775260a32662b70117d6cbcee8afe353058b65218
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the final malicious destination. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://faprosid.com/file/77094757134.pdf In PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16082a31584381---56448228504.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0bf5b456---87771693330.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/mlsng0ltbq55uut9v0a33l2vai/zaxuketotinunefakurinos.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c0c4b9be4---44971985115.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/fufipumoxusunejatodo.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/zafobazitewuni.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/badal.pdfIn PDF document text
    • http://cymagun.com/userfiles/punizatigivipa.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/84597979396.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/wekikisugosoxo.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/vesupegirasix.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/bemalinixoradim.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcffe1e37---giburadetonimukowitumopi.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/fasokugatejibubeta.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7842629d3a---vujatizisiriwuwiwu.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/mupitunelavewoxibagirak.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160988b6744542---30463437129.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bea6019c7a58e92316e29ad1408ae324/takezowukovaxuv.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/93723343499.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0153146826b043de136a54f55d68993e/65092708892.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/34000993886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=banja+tu+meri+rani+mp3+song+download+lyricsPDF 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_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 16332 bytes
SHA-256: 22f82d4d9fbbb156471982e4c1e0569feaa4553a6de72cbb12c685e7fb815aab
font_01_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 11512 bytes
SHA-256: eb4797ef5201396917308052d2a7685173c5cbf78acb4be70efc5f26f2b08c2c
font_02_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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