Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf3e04754cf0b6c…

MALICIOUS

PDF

68.3 KB Created: 2021-10-03 11:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d79dcb0c8a7836e4fc0f3cad1805f896 SHA-1: aeb29d87498432bd6a8de752130548ba6e0dd830 SHA-256: abf3e04754cf0b6c41e003ad14a1ee833615695dcf4b768c44b01a6b0c69b778
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, and is flagged by multiple heuristics including ClamAV and an ML classifier for malicious content. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior strongly indicate a malicious intent to trick users into navigating to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 68 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 http://cementfeet.com/userfiles/file/matogufokisazepukiv.pdf In PDF document text
    • https://silverbirdmarketing.com/pages/images/file/nimixezegogopufide.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/52724555704.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/xupelupatejo.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091005275280.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/97556276353.pdfIn PDF document text
    • https://led7.ru/file/zemilax.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/setibitowukovezuwozefod.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/waviralebaveputige.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/66003358264.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/30274220133.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/34466056670.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/21214801535.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7d36fb14---wazulagowaso.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/segakorigonasajij.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489b7b31b4c---vugukapokezebafovetu.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/10499373550.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d85b8ccd96---44410928753.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/mugovonowutobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=types+of+sentences+powerpoint+7th+gradePDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/65324789006.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_off0000ade0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE0 14460 bytes
SHA-256: e6e612369eb73037de6bc0a475405cda1d0c7412874e1b33a9d0e5727c77c77d
font_01_sfnt_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 11068 bytes
SHA-256: 7c8e1f8e788939a4cede1ed3a2abda2ae2ff50eb30867b438771c9614105f9fb

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