Malicious PDF — malware analysis report

Static analysis result for SHA-256 08832b9e3f3e9d90…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 14:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 138fb87ba8f14c5fd315f80c0799a443 SHA-1: 38ad075be049a7e5880b0d9d44706379b02db107 SHA-256: 08832b9e3f3e9d90ce5a75a36911607b5e75e40d140320f56b69578188850bbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=wrong+turn+3+dual+audio
    • https://sainaudit.mn/File/92046087690.pdf
    • https://aymsoft.us/aym_image/files/rujifopuz.pdf
    • http://xn--elementy-zczne-kwb98g.pl/media/file/20093913485.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/61371592800.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cf456f5b6---77845850164.pdf
    • http://jmk.kr/ckfinder/userfiles/files/lakibepig.pdf
    • https://luatsuavina.com/userfiles/file/tikesexef.pdf
    • http://grandfiltr.com/files/file/11775648630.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/lebot.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81f76539b---rutemawisifanimegoxagef.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614384f615e57---dewotanuwosuku.pdf
    • https://excore.hu/ckfinder/userfiles/files/16180983866.pdf
    • https://anandamsanyal.com/userfiles/file/sokowelojurunuxosefulez.pdf
    • https://ostrichtours.com/ckfinder/userfiles/files/munexisoroxidew.pdf
    • https://novahealthclinic.ca/userfiles/file/52275950436.pdf
    • https://glaskunstcentrum.nl/images/file/26089928613.pdf
    • http://gdfsztal.com/uploadfile/files/95610620910.pdf
    • http://mabifitness.it/userfiles/files/bozik.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dc069b0d8---79753471104.pdf
    • http://inbjnews.com/data/cheditor/0603/files/ruzivomufapulobuxa.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa21d27932---felejovizo.pdf
    • https://jocafoto.com/fotos/file/81616517665.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_off0000b0ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CE 16792 bytes
font_01_sfnt_off0000c8e5.bin
ad07fb776817a2a0fab7a1d30f98a4346d2e1545d89e60782a1a456f7349229c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E5 10388 bytes
font_02_sfnt_off0000e049.bin
5d8b75388378ae47bf1330522114367483089ccf3533638c1c5b2a69efc3afe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 16044 bytes

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