Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4d111aef1e2461…

MALICIOUS

PDF

87.9 KB Created: 2021-07-03 21:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c721098243538e3dcdb451a9c9564693 SHA-1: e8ca265e1836cd63974974ed2e04154c5be16976 SHA-256: 4c4d111aef1e2461b9c736fcd05d7e33ca182762e6fe281252ed75d9a8516085
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as lures for phishing or further malware delivery. The document body is unreadable, but the heuristics strongly suggest a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f571dea27f12237b29c901f0eeda8e6b/24869357453.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/bokuvexe.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/74733013841.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852cf5d7460---55586412480.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a18de3381---jisadeforevalixaw.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/68273252199.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/64631916128.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/sadevidemapej.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160903fb35b7e6---gukojoxitisi.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/kofenikiru.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/63db5553b40b655dda352007f196bfce/98937025859.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/kg66nvd40i98l02ba45jmifqdm/20481118838.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/mebekepol.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/4e9b2be6be91490121f3d9913d0ed057/bibojulugido.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16099d367865bc---tigusoxu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608381f4e09d6---75758275392.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b709f8fc69---60921187705.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1e6e1a59f0da0b6268d94cb198012da1/bipibupewowujofurujovobuw.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/lexufivozuxizodakapuwar.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f7dad648---44068726998.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11629b5934---77319739655.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/54320ccce534844524f21eeea97edae7/desemunilege.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d4c92e27---saparavokabixebimatodimem.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/61198698094.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fb5c47c02743f51dfd7ccd8c70bb7549/tozunoxuzunavimamiguvima.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vrdkq78eu0um8s77vkrktfm45d/kenopekixepefela.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d785d868ec01d0a07b85593028d82779/39474171785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=german+dax+todayPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 10356 bytes
SHA-256: b4ede40d4bac61b98ce223fd581ea17f4df92478bebc57403b7edf1a4bec7d54
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 22568 bytes
SHA-256: 4f94b6fc3827d5ecd13b41885e0779d1f74e6fcaa5b128a33c86c1ef0c60836f

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