Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0a8b9f50c8229f…

MALICIOUS

PDF

93.9 KB Created: 2021-07-04 02:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 994ddc683b13ed321de19f6bbb18d64d SHA-1: 604965c80755e3d0057a11d7a8e3143903ab720d SHA-256: 8c0a8b9f50c8229fc3f1f1215b2f328a12dbecdf190d8fa625b35036d4c0219f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to lead users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a link farm used for phishing or malware distribution. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/c7a5c3e53ab43998949dde57920dff50/3940027761.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e965f751a2---gukorakerebukavovosinu.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa763c32d---64194280271.pdf
    • http://tajeer.co/userfiles/file/96657621445.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/00bd18e9be8952a6c21caee82ebb8d4a/moxinerepedojudawego.pdf
    • http://meta-min.com/files/wevuvomuzaw.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c259e2ccebd---baxemixasolasan.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/473cf61d6f8893dd441d9e989a7520e7/7049569644.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90333313405.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06dc56d89---20903618130.pdf
    • https://holocaustresearch.pl/nowy/photo/file/bidiretubugenusuwewivujak.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2d6449f76---14433965222.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdf8be3e22---petope.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a242db20e86797c956afc459ca27ee48/67650358621.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/p0s268f2pit14sc7ccll79kjtu/zidiligobuwo.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c8acdb52568---75976784742.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba75fa38a5a---tidan.pdf
    • http://novichiha.ru/pic/file/zepolugejetigexugulesiko.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a7ccdc119---luxokesibenejusonofuxa.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c83e3248b7---24434322916.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4458859687eaa1dc2bc06bb9a2542714/guvewusuxekuxawiseguruvu.pdf
    • https://eslms.com/userfiles/file/sonusoxi.pdf
    • http://angelescare.com/userfiles/file/tizovijizajifese.pdf
    • https://twr1115.net/files/fckeditor/file/87628206400.pdf
    • http://clairerolo.com/userfiles/file/gujowupurinotoxakosi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=class+4+evs+chapter+18+question+answer
    • 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_off000109d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 16792 bytes
font_01_sfnt_off000121eb.bin
b66d9007298d25f8d8b7f083d5f3f548f4c3587baf48a5f8f687e8b0d0d9b4d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 11240 bytes
font_02_sfnt_off00013c61.bin
2af647d099964c42a336c0eccd8ac9126234f062a7ce8da27b8beb87e54d97ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C61 17016 bytes

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