Malicious PDF — malware analysis report

Static analysis result for SHA-256 5900214619f146e1…

MALICIOUS

PDF

95.0 KB Created: 2021-09-08 18:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ad0df23a93c12bb0a10bd999fcfd044 SHA-1: 0c039429b34745b7ca3105e3adb8355d5ecb97b8 SHA-256: 5900214619f146e13fc5028c404a6c62eed49125eebce3633884ca9c3ceaacfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://zzps.pl/userfiles/file/lidumakagedizu.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/q18ej77cir2l01eakgqci0pi64/jugazozi.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/vizufugelisikajoxid.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ba2b29275f4452cc142fa1c13c771027/kivatefesog.pdf
    • https://crc.creativechange.net/ckfinder/userfiles/files/90645818996.pdf
    • http://abwalabamaave.com/uploads/files/xapadiluxegalikofuwalizu.pdf
    • https://tsolisp.com/files/file/gogerawepimobabamufaru.pdf
    • http://stellar.ru/ckfinder/userfiles/files/45910047.pdf
    • http://humanlitech.com/files/files/turis.pdf
    • http://ersenergy.com/UserFiles/file/kenuzowixezalusubuniduguv.pdf
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/liduguguwav.pdf
    • https://umiyawoodworks.com/fckdb/userfiles/file/72954625128.pdf
    • http://goozzl.com/userfiles/files/23261457971.pdf
    • http://bellamy.tw/uploads/files/202109041008181725.pdf
    • http://eternoohydro.com/d/files/puwokon.pdf
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/wukugidixivuzojexul.pdf
    • http://acelybio.com/upload/files/xedavasibigusupotoj.pdf
    • http://kvbm.org/pds/userfiles/files/72453854468.pdf
    • http://omegapizza.net/uploads/files/36360359732.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161369a06c9e4b---jakuduwew.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/gimegijawemafilaponod.pdf
    • https://asiantms.com/ckfinder/userfiles/files/42313679836.pdf
    • http://jatechkj.pl/upload/fck/file/wunivod.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=capacitor+types+and+symbols+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_off00010fc5.bin
f1f96dea0b95b56f292ff8e8f416d87ea3a7e7add3a151a69b882c5d81e577b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 17140 bytes
font_01_sfnt_off00013caa.bin
9f03fbfa56431d3a3034ca8518d3c3a28e76869e67bfd354347a4b5c8de9412e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAA 11064 bytes
font_02_sfnt_off00015641.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15641 16792 bytes

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