Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3ea36481c595b4…

MALICIOUS

PDF

73.2 KB Created: 2021-06-03 03:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2b856501a004901b873cbcefe435afce SHA-1: bbe40d2b1dab8e312db4dd86dee71b8f69cec8e6 SHA-256: fe3ea36481c595b4aca6ccb60e2756d98153d1f48bdbb9e028417584fdbb766e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm or phishing lure. The embedded content, though heavily obfuscated, appears to be related to technical instructions, further supporting a social engineering pretext.

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://allytemp.ru/uplcv?utm_term=how+to+reprogram+comcast+remote+to+cable+box PDF link annotation
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097e0cbe66fb---31360551636.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/268543c7a5b8e2e04ca5c64f198078c6/71905165744.pdfIn PDF document text
    • http://fitviewer.de/files/file/58006953634.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609102ba1b544---88109711419.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/gixanasoxet.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/ac37fa1efaf25745ce18b2de7b925a09/62825134274.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/gpltt86vmfqbt2a9e2it9n6a5v/dunozeje.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9efc39ede46b2aa40e84dc1e1be78024/97724765179.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/05aa5cf16e512ae426eff8e72b1bbdf7/35351737323.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1fda7ab07c8922d7bb65275ffde5429d/49890279750.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/gbc3r2sdhec5q4o630t1blaodl/30617761141.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/eee564d9ddf0e160fde5a812460efc29/42774643057.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a623ce860bb---73502632988.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/bba3fc9119c2c524c350db81c1ab6318/zagorisozofotoxegiwuv.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 5512 bytes
SHA-256: 2523299075e1f6225c874cd8e717f2a0e9a31856d5f3a6a93f092b9981b1c29c
font_01_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 10568 bytes
SHA-256: 118bb43248b7ca320bedd19f465abdd73dce0a736d244b53af3b554b43a11754