Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec61b1473bdeb14d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 14:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e49301f6825128c2f26b1ddf7591fee SHA-1: 5f320b52e3a342759ee05402e592f6f07e5cad90 SHA-256: ec61b1473bdeb14d9c9fe71afd9974ab79d1e5d85991b20c2d06ab96a94c6fa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded content indicate it's likely part of a phishing campaign, possibly leveraging spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=the+region+of+visible+light+which+is+most+useful+for+photosynthesis+is
    • http://mixline.ru/img/lib/file/teluxas.pdf
    • https://jin-hung.com/userfiles/file/bixazitusi.pdf
    • http://katela.net/userData/board/file/67203272471.pdf
    • http://sbcnepal.com/images/file/lapevonejitibodaribu.pdf
    • http://transchem-tech.com/Uploadfiles/files/pejazifuguvosinemakuwopem.pdf
    • http://sushimura1.com/uploads/files/56922228171.pdf
    • https://propiedades.net/ckfinder/userfiles/files/korim.pdf
    • https://ivanamihic.com/files/18947723777.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/nva14eu3u8qe2hdd81punr57q1/68841685056.pdf
    • http://studiomistretta.com/userfiles/files/metafatedej.pdf
    • https://eirai.org/editor/ckfinder/userfiles/files/tezageg.pdf
    • https://soosekszer.hu/upload/files/detinafedefulurag.pdf
    • http://uptownchantilly.com/uploads/files/93955734068.pdf
    • http://roberlo.cz/www/files/file/62183582762.pdf
    • https://lee-trading.tw/archive/upload/files/busofabosapagobopatumet.pdf
    • http://ppogrimall.com/upload/editor_image/file/migiradufewevaza.pdf
    • http://penzionriverside.cz/files/file/96118915377.pdf
    • http://ghettaetamionarchitetti.it/userfiles/files/nogevejisutalikapam.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7e511e550d581a93d582989773d84c59/42511395265.pdf
    • https://speedwayinfo.hu/uploads/file/wunisub.pdf
    • http://frchem.cn/upload/files/79551945799.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/0bd2559e99e4efe6ca61685376172bac/17911269942.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4ab2f8dd3315705df41fc16de84223d1/dodulubiriw.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 16792 bytes
font_01_sfnt_off0000dfdb.bin
3c243b4aa7081cdf4f5307b1a94f22be593095c2699d2b4748f75d6d0ec3fa1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 11236 bytes
font_02_sfnt_off0000f9e2.bin
fcfb7eacea90fc7eb6f1836131d6b5b83bf90585325e2128846dbc5d471b9d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 15792 bytes

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