Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2c0447cb5ec9de…

MALICIOUS

PDF

99.5 KB Created: 2021-08-20 23:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 59cc11cb71bc0eaea4290bd71936e744 SHA-1: c4dbac1f3e469dd7e0cd62ef53852f6f40975127 SHA-256: 4d2c0447cb5ec9de29281d2f21fa7e807138967a5f57ce2a9a0e2120b8c89c75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs are likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://kinel-hunter.ru/upfiles/file/goxuwelekikujasa.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61288d873---15529311633.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/uk9hj64ork8e5kgupv9sv3s1k5/36855931514.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/rfm1fc13h05o5e1ujv6fg3eufu/14391309628.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f0215cae8---47639357395.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735815b1479---jananubopesejakodum.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/wozatagevesurixifijol.pdfIn PDF document text
    • http://fabtur.ru/upload/files/safobikilipixefafekob.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/71325916375.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ab1l2unmgatn3ej72c0g65ae70/77220453341.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca37b520a4a71d83e5be2357bc8f3df8/zijorovajoziketopi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/5jnastgunvdpndv5q3ipvjt77c/vexajivoluvarumitevuxurer.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a906164d6---53626499386.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/rizaf.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a84ef0b4e220768076ec7a6ac5dd6f07/badatesimelubibixaruru.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/71909076477.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/824caff570620f877c2190e4a99ff533/89877274426.pdfIn PDF document text
    • http://klinok-saintp.ru/files/37917758034.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/zunimivimukutatujafaderoz.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/jizizogazavizarozabip.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/xanetelawenotofubuv.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fef5e3d1a---44911960202.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16105afe69feba---51328680891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=evaluacion+matematicas+2+primaria+santillana+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 19360 bytes
SHA-256: eb4f736b2dff119c26671c2aff504f7dc67ee621e1f69e7b9063b58ccdda6fe7
font_01_sfnt_off00014b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001638e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1638E 11052 bytes
SHA-256: 52dab66c1b05e2c3d08358ba1de4c53d6179ba8652e36638c97ba14e0cb30a5b

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