Malicious PDF — malware analysis report

Static analysis result for SHA-256 03931ae2cc5fe773…

MALICIOUS

PDF

67.9 KB Created: 2021-09-04 01:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: eeff20cb90a3c26561370a623c7eaa32 SHA-1: 6c5ccad8e8ad327997c8530e29e6904badaf32e6 SHA-256: 03931ae2cc5fe7737da1e07cf4e43736589b99ed26d2d47a32e9fd3f6403791c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous links to external domains. The presence of multiple links pointing to compromised CMS upload directories and disposable hosting suggests an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://oniceh.ru/uplcv?utm_term=bissell+pet+hair+eraser+1650a+manual PDF link annotation
    • http://ediliziaunoaventi.com/userfiles/files/ralilepuzoxavosunubi.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/31527471827.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210612215443830129bd1712.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b212ac0cce9---58067928527.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/92680822747.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c071236f70d9dd16de746c37cdc2759f/74313395676.pdfIn PDF document text
    • http://techbis.pl/files/file/93842253430.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e33909c3957---64624059746.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/virofevu.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26663995626.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/takatixozimuruj.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623216228.pdfIn PDF document text
    • http://recviem.ru/img/upload/wadug.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070a00d034bc---14522436811.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64e6f3dcbf---ponutafimefunizobomen.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/65727531230.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160824d23e02f1---99882019039.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16214490473174.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ffa9332d---zugutijelixuwerule.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/piwapibutajenoxitegilesim.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7ea8bbfb5---96473957001.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/725d7rn718837gjtobset4afl4/71259878727.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC569 13712 bytes
SHA-256: 334ffa21ba68cbb83e37b9c780838d1474fc3b7dd5b23436b8c7709a9ca5cab2
font_02_sfnt_off0000e6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 11024 bytes
SHA-256: c31c55c9095dcf2738c2f73a837c64633c50bf5d8d465cf4af7ab21ae07a62b7

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