Malicious PDF — malware analysis report

Static analysis result for SHA-256 af45c618955c68b5…

MALICIOUS

PDF

80.1 KB Created: 2021-06-09 01:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f29a3c7ff95ac20d8c31a2399b79c9bd SHA-1: a835a564fafa7080502686952321413fb8a02432 SHA-256: af45c618955c68b52653f3b8f681bf52aaef0da187fed66f96a0998ce386d98c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF detected as malicious by ML classifiers and ClamAV, containing numerous external links. Several heuristics indicate it functions as a link farm, pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://medvor.ru/uplcv?utm_term=oogway+ascends+midi
    • http://2478.ru/admin/ckfinder/userfiles/files/31635919376.pdf
    • https://allcreaturesinc.com/files/files/13727865710.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa043334594---levudo.pdf
    • http://vyveva.eu/UserFiles/File/kivesikimipa.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6c8j5kbvie5qd07eiefisnfuk2/sugogeregepiba.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/folufolagamegikafolexoge.pdf
    • https://autosaloncenter.com/uploads/file/loduxibatiboromofifawub.pdf
    • http://asfus.net/virgsurv/userfiles/file/29442120170.pdf
    • https://actaviaserica.org/board/file/files/jezegijofusaradedibip.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/fd4ad07ef5352dc1506a59d558112ae9/31933485528.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/17e2979859b8508421ddd5f20a44df82/wozusomal.pdf
    • https://agrimal.pl/userfiles/file/migenapowewegi.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abd8fb5f0b2---nexosamawakiponavewi.pdf
    • http://meble-tk.pl/userfiles/file/75697889110.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d6.bin
8b4fd93f74a1b7aeca2564db67407bb57897e6578684e02bbfafb991c79cc7c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 5352 bytes
font_01_sfnt_off00010514.bin
ceccb25ae6433572501061a89d7e79b66bc68de8172081139e566e3f4fee8d94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 14916 bytes

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