Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b42374cf5e7af0…

MALICIOUS

PDF

89.7 KB Created: 2021-06-25 16:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 963aae0cf7897eeb4ca59e2c4049cc6b SHA-1: 03cb1d7481ceec0b75cafa7e9d767079f0d03ba8 SHA-256: 28b42374cf5e7af090336ac347fdef618282921cabbcc186d2c29580fa94c852
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple links on compromised CMS upload storage further supports this malicious redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/825c10ec1a047baa2e51778b45489013/90349761589.pdf
    • http://al-farh-iq.com/upload/userfiles/file/87014017444.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47c66f26c0---68724568615.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/3985274109.pdf
    • https://faresaldabbous.com/uploads/files/62682174980.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaf3292052---81948992145.pdf
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/24467158603.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc49924d55---powavurusev.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/87fe91df0bea921afd4a6f4cccc005d7/14996757908.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c90d745a3---77653335837.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9558963dc0---87824202325.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/pufoxoxiwopojusamezip.pdf
    • http://arabic.cz/ckfinder/userfiles/files/gesapuvomabolefapuwiv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=successful+learners+tutoring
    • 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_off0000fd45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 16792 bytes
font_01_sfnt_off00011557.bin
938e263ec3be08fd5926c84bf1aed92878860e031668f5a675df2260d8d6f1c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 17032 bytes
font_02_sfnt_off000141bc.bin
d5d0c4772aaa9e4c9dee89a53942802d8f57b8ac81e13ec43ca7932483fe2356		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141BC 10688 bytes

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