Malicious PDF — malware analysis report

Static analysis result for SHA-256 669e07d71cd6bd7c…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 05:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c5dde1716b1af37ddfb0caf019a80bf SHA-1: b471993d65ed764b5cd5b67120a5712cb302660c SHA-256: 669e07d71cd6bd7c5b26dffecfe2f0a34f90965fc7dae890e26d5dff5ca95310
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links. The file's structure and URL patterns align with common tactics for distributing malicious content.

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://laborke.ru/uplcv?utm_term=words+that+start+with+e+and+end+with+z
    • http://edituj.cz/res/file/61480841931.pdf
    • http://kovospm.cz/fotky/file/xuren.pdf
    • https://medgal.pl/admin/ckfinder/userfiles/files/bezuvanon.pdf
    • http://salespate.com/userfiles/file/10192611301.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/86208051609.pdf
    • https://tonmathunglan.vn/upload/files/65189051040.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/63237638803.pdf
    • http://hanyuchina.com/upload/files/zefogusilumovo.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee3e9e7fc---pikirazogizidagijonubome.pdf
    • http://zulassungsservice4you.de/bilder/file/bevararogefolixixufosotes.pdf
    • http://tainanrup.longi.tw/uploadfiles/files/20210917_052713_8819.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146912ddbb00---komex.pdf
    • https://fsbulletsandbrass.com/userfiles/files/moralefowixala.pdf
    • https://dukupahit.com/contents/files/saworevixamenarawimosamax.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1614340394656e---80929411960.pdf
    • https://maffart-guy.com/userfiles/file/degaba.pdf
    • http://kkc1.org/htdocs/cljr/data/files/84501637318.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9412884db1bfa792e0f21d6361fcc847/suxazemoduzuxosokujibibaf.pdf
    • http://n3ss.ro/ckfinder/userfiles/files/livoko.pdf
    • http://smingames.com/ckfinder/files/pakikezekara.pdf
    • http://ilsungwarehouse.com/userData/ebizro_board/file/vanuk.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161308182a2490---51303786648.pdf
    • http://aristosaigonhotel.com/uploads/files/8820680281.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_off0000c878.bin
827154b6096c16bcfeb8421f058494f6994a4dc7fc8598eb5986801c289c5f04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC878 10436 bytes
font_01_sfnt_off0000e02f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 16792 bytes
font_02_sfnt_off0000f841.bin
d198f46d0ec09461a912c1dba1ab97e6cd524bff41f518f147288e1cfec2a91e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 16816 bytes

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