Malicious PDF — malware analysis report

Static analysis result for SHA-256 3541d1208e5684ae…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 08:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bfd26fbdb28b72af6105dd706f5cf60d SHA-1: c3a76732fda40c53f0b8a96074312e6b536e3ff8 SHA-256: 3541d1208e5684ae4df2dc8ae76af133e87889e68a394fddfee6717e78119fc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=nook+simple+touch+root PDF link annotation
    • http://litho-and-co.fr/ckeditor/upload/files/winosumawefizajizejeziw.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/pugoresowepawurapof.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/42914070680.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3b347925---7944969350.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613825c377882---70466795258.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613827122a933---lafeji.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/19321617247.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/83027925687.pdfIn PDF document text
    • https://rotitelor.com/contents/files/86430339999.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/34695357015.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210908111700.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/96498370852.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/16233857431.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/kibukuxubawus.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/zalasavoxaxowutovuf.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/46165935706.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0531036dbb5f4229c93dfce072ec7688/gaxulujite.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/65197537228.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/68265308468.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/30993581753.pdfIn PDF document text
    • http://snsi.jp/image/news_file/bapelizegij.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/lusizukisekalefezobu.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/83515040185.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613488dc0722e---51381027963.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://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_off0000cca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA9 17792 bytes
SHA-256: 863ee3dcf83a6090fcf5edf3080b7db580a2a267de8abbfb47e3e37d66b1a3bb
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 10544 bytes
SHA-256: 48efafa55b7da23040508dd9341cdf7e7f8f415d345299e6db0aa8f4cff1865c
font_02_sfnt_off00011302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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