Malicious PDF — malware analysis report

Static analysis result for SHA-256 5313bee3acdc778a…

MALICIOUS

PDF

73.7 KB Created: 2021-06-12 07:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cfb23dddad579e4716b071bebe31506 SHA-1: d961bf81497ff36d31d6577a6a9a1047ce6c2f2c SHA-256: 5313bee3acdc778ad39c4b7f30d5705c0ef65a52c8e7320b0958e1f181b7e2f2
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=despacito+telugu+version+mp3+song+download
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5263973a---zizorakenesor.pdf
    • https://burgaseguros.com/userfiles/file/7412480512.pdf
    • http://toyotalongbien.org/data/dulieu/files/pezup.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2f08d1d8ef11c79cd9eb3d3eb7007da1/14843033131.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/78264e3e2afbedc94fcee1ed4367e336/90352714067.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070356e12ea7---vogeluxekifibugisenedi.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ralapufuluguk.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a859146ae97---retezunu.pdf
    • http://ceskylakros.cz/userfiles/file/sodisepatitepife.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160984a39b5082---wemefatulegarimafil.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ebce4db1c---biputosolatebej.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/aa5upaes3a9pkuvnfbic6623l3/80490575490.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60f0bf173---banibelasesez.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_off0000e0eb.bin
b74c95d3ffe5ea42477df56b61f3a43ff26ebb37a42ecbeae09cb4cbd915d090		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 5708 bytes
font_01_sfnt_off0000f462.bin
2425427b7a61a6b8e513d04eae7c12fbdc511f2e514d16ae23affc8c9f4f7933		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 10972 bytes

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