Malicious PDF — malware analysis report

Static analysis result for SHA-256 0517ceca633d4ceb…

MALICIOUS

PDF

95.5 KB Created: 2021-08-07 22:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad900a04975323da90ca4f30c72b8563 SHA-1: f8fe498bf7f09fbe0ff8823a1c0e28960fae6f42 SHA-256: 0517ceca633d4cebe09adab4d74c4f54804e78ea65953efac83b4811894c6709
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of external URIs and link farms suggests the document's primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995536df486---17153815383.pdf In PDF document text
    • http://vertinu.lt/ckfinder/userfiles/files/20778022834.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/8872f8a7634a9ae6128fd2f65e6832a6/8269621208.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60734720996.pdfIn PDF document text
    • http://humanlitech.com/files/files/32046648846.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbdc71a958---kesubexanagoxasoro.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/1edjjugi2rj67aen3g8kbq6hsu/ritomapek.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/majiwuselixumaz.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/496983fc33b01d65ffbf3ca17820767d/15933418006.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4eg90hji3ue9mq5loilun58eun/rejimeki.pdfIn PDF document text
    • https://unitjaya.com/contents//files/63056686890.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/nafofasa.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210802201633665.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/pupebubezabosaverujudos.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/ribatatekuwu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16105534dd28d0---vewoxidadunoviwu.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c861c7f7f9---24868808570.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a394a7f152---ridoponezaxu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9b9cae876e46aefcc406264638e758d7/68535404046.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5c5ebb9ce7be0fd92ccf820a981800ec/xoponobizenarijajanojamo.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/19136718335.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/bufipovutusujodesube.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/riwapuvubenesile.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/vureniwerajakomixako.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/t583oo66ar3cosugkv9av6gmg3/zesojabebot.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/hpqvd37q5mm2ctt63k3oj9hra0/82212094906.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/ralibar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=guitar+chords+chart+pdfPDF 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_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 17308 bytes
SHA-256: a6ee4fa2f90948d2204d9436c066ec6fd497e7dafe75cc9f181c84c3aef794fa
font_01_sfnt_off00012981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14198 10572 bytes
SHA-256: 3cca583e77063f8adb83637ac6fa039da21b35e0161aa1b4b3bb8a084a197aed
font_03_sfnt_off000159de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DE 16076 bytes
SHA-256: 8467c6bfdc06f6e62bce096f2f04102b162f7b00f0bd11e35caf2ba558a9b07b

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