Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ef4ad807e3bc91…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 05:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 511749dbb14c6cc00829f8691fb243ae SHA-1: 2ee8815fb81159274ccfb8ebd87c90071de6077f SHA-256: a3ef4ad807e3bc9184821704de14c854ce9f45ae78bc6dae8d6d1ca9546eb46a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to compromised websites, many of which are hosted on disposable domains or utilize WordPress upload vulnerabilities. These links likely serve as a lure to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=meaning+of+name+philemon PDF link annotation
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160df9039c3ca8---90517929249.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/miluliwiwokewaxejor.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/4f575c6058d69a1acd85f9c548e38b8d/kenele.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8c55be097---80766062902.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/wozokafaxezonegifadediwo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/498afb02f2d3dbe5aea29b9e8a41afe7/77132171899.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/adf1db0e715601d3d5a1ab9757ca5113/3788160240.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/tijetakune.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/gisazuzifisepimuwibadupop.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/64079334640.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/rezilovukavadib.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b5595cfa52ea7a3cd3bb6ae501cc73c2/96587882993.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/vegiwomovuvibeb.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/raxovom.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/86499169374.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aed6543e8---tuwawutidewugidamizomanu.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/juwasa.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e29214e56---susader.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ee00d647161c899f31abbeb62591212f/10679076998.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//96287000265.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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 17528 bytes
SHA-256: 411c6f5432971afc0905d30aadc4c1c04a9350be340b04922d7659b77bf4d4d3
font_01_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 10432 bytes
SHA-256: 4aa8eb83731081fb8e58bc7aef0718452dcbdf2d751e976778336f01b0f7a6df

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