Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb997c5fb5f21d7…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 11:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f04c9f783d27a3264165665bf71d8ff5 SHA-1: 819ab675637f7735f99469b616753975ed9cde52 SHA-256: 5cb997c5fb5f21d7ad1dbf836e7d6854c5fa57be83fe74fe060b3f5c8b4e2c20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=hill+climb+racing+2+hill+climb+racing PDF link annotation
    • http://ahzycw.com/upload_fck/file/2021-9-2/20210902212327164597.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/76523119351.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/bisiwetoja.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/ponetasopupukudij.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fddf2232f0---jezorimopiwutasu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qqfl8rnim8648sgdvofua0fghc/89626360980.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/nimegifosogo.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wegumusuwizikuwawagiwego.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/rebozewevepoponejejozo.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/cf0c74932a7b1c70828aa2f8c247a55a/47929504525.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/40756240936.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/73838488764.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/mowikobuzexewuw.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/97198084668.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/jumelisevabex.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/noresawobivuneki.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/jevezufaxuka.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/66310103568.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/woganuxosar.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/jubuxexakebatudevig.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/57759727522.pdfIn PDF document text
    • http://teakdeck.pl/files/file/kitagajigefuravesebo.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/13586092728.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/naroxodututef.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_off0000c0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F4 16488 bytes
SHA-256: 1cca937e597a444935c06c8dfe6de688a88103db4d4982305802b512d02c234b
font_01_sfnt_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 10412 bytes
SHA-256: 14fde7d36aaf1572bef8027473439c41f977509e84207f7d68ce5cf8ca02e4dc

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