Malicious PDF — malware analysis report

Static analysis result for SHA-256 0609b3f9f102355f…

MALICIOUS

PDF

74.6 KB Created: 2021-06-09 05:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0cd99f0eda1ce9795ec898dc938a1d6e SHA-1: 5d1677acfe79b6a2598ddedb6483cb8684e85b9b SHA-256: 0609b3f9f102355f6159c851485e7b416f44621bd6e2bf3eb1ff2476ce772bd8
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The document body, though obfuscated, contains metadata related to 'wkhtmltopdf' and a media title, likely used to disguise the malicious nature of the embedded links. The primary attack pattern involves directing users to external URLs, potentially for downloading further malware or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=testament+of+a+sister+new+devil+season+1 PDF link annotation
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/43c9ce4e200760b8e939da769a07fa59/16555083958.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/lovsm5tv0c1ioird8k0ihfvanu/gibinakamagejikepu.pdfIn PDF document text
    • https://pmms-online.com/assets/file/kefuvodofusotowum.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/53b1dvghgupvttu4sk7l1kkghs/tenerukeravin.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/dasotuxafisivejo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/05bb49fcc7357a12667cccc9abf3bc1b/83852353806.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac7d7f378---tinukituwokafo.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/79792541209.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/banibopuvewabaxerob.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a74e5aea4dcd635d9067c56fcb572bb4/wolami.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/38a913d5fc7859d3b986f9a3889d4807/pabetogivura.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/31308976265.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/jokeperupirijeduvixol.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7cd8f4008---33610331641.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/qv7lgu28qj9onkrq7vshrtqtm3/gatevebovuduzivina.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/3a585b12859a028aa92decdae5828963/zavutitasajifekaluxomekul.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb7c92696b---judadulatib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 5208 bytes
SHA-256: 4f857533461fa5acc3fe6e1146f31a1a45d66d6e06bbc84920fcb38dff2426a9
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 13764 bytes
SHA-256: ceb31c28614ab9c00cb1f963f3ff4f639052644f56134a72ad2fc081988d358d

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