Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ac012e9454c343…

MALICIOUS

PDF

69.2 KB Created: 2021-09-17 15:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f68dc07e7d0b623b035da539db3fb57 SHA-1: 561b963b02ba4901e0d7ef9fa867259cf21c93f4 SHA-256: 39ac012e9454c343084dd6588d7c14a75f805ed0ab392544c2dca2231151fb64
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and embedded links pointing to potentially compromised websites. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot hides a clickable action. The numerous embedded URLs, many hosted on what appear to be compromised CMS platforms, suggest an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 69 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://www.mamafoundation.cz/ckfinder/userfiles/files/dinamorajok.pdf In PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tofukepodatijetudu.pdfIn PDF document text
    • http://qdjshg.com/files/file/42930632092.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/68199120515.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/71810816291.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/29264292848.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/94056380188.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/gififosevifuduwis.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/vapesiresufiwal.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210908225456.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5015583592f4a5a006b72ad4e453b9ff/fejojuwetew.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/sevamafu.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/4442476026.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/24950917367.pdfIn PDF document text
    • https://akemi.ro/hirek/file/jamorubijatinebanot.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/suwolawonekudozowexonada.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/28736957379.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/89703883550.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f037007940---regopoxezojagokogorafuvag.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138d2203b9---bomomikizug.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gafokuxite.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/19715821691.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/jinapuzufin.pdfIn PDF document text
    • https://agrando.cz/files/file/tawexo.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/xeguwexumow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=combustion+of+carbon+monoxide+balanced+equationPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB203 11156 bytes
SHA-256: acc13f25cbb327bf3efdab27ed30baa46e7eb1c81ae89f8d0bd6389e209b76b1
font_01_sfnt_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 14244 bytes
SHA-256: a9e188f2e5a903c999d0c674ad3b4145c7d46192cb72140445114cb4685b28c4
font_02_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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