Malicious PDF — malware analysis report

Static analysis result for SHA-256 44592e99d2ce4f66…

MALICIOUS

PDF

86.1 KB Created: 2021-09-05 08:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cd56597d3f39bb29a81aa1f0ce0bbd4 SHA-1: 2e3aa9d9b2fd2a3ff88fa3163aaf6531e165dc9c SHA-256: 44592e99d2ce4f66d3e49c7062189354b7d74abb9f6bc56cc65d9f18de8b9db6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting. The primary purpose seems to be directing users to these compromised sites, likely to deliver further malicious content or conduct phishing attacks. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=braillesense+polaris+user+manual
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804cb19f977---6904897648.pdf
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/mulixovukemidonemibuluse.pdf
    • https://hotelcorona.ro/files/tugilaxuwabib.pdf
    • http://seattlebestteriyaki.com/uploads/files/tejiregovafixejagetowamu.pdf
    • http://crescentcarpets.com/userfiles/file/80531634263.pdf
    • http://marymo.ru/uploads/files/10721929003.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06639b913---nuvonewipemuroduraribo.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87a3319b5---91127943799.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ddf93db2ad11fd6255d23495a572dc03/pobebilapata.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f39ce5540---kufopuj.pdf
    • https://capecoralliving.com/media/file/66831679368.pdf
    • http://nensi.si/upload/file/52709239709.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/63978906679.pdf
    • https://toppelletmachine.com/d/files/wujibolofetusabozunubew.pdf
    • http://accronline.com/userfiles/file/29276882340.pdf
    • https://ispartaorganizasyon.com/ckfinder/upload/files/ruwepetasu.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20311ac6d---50550123600.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/5e66930c11329ce8da732a2ffef1e382/rigutenifarirojeferunigu.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d0560c052---27278053264.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a7f1a1cf86282a1a100e16b6207c7f89/92989137420.pdf
    • https://ludifrance.fr/userfiles/file/jexozeditizowidetibi.pdf
    • http://hollywoodterrace.org/clients/863344/File/rixexu.pdf
    • http://akvari-um.ru/userfiles/file/vazemo.pdf
    • http://gamebonda.com/ckupload/files/21761628448.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c755dd62921---18920895037.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_off0000ebe0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 16792 bytes
font_01_sfnt_off000103f2.bin
d0c0d9b916b114cfdf0ce75ad1fa729b74dc557501559b74941828110d9b26f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 18172 bytes
font_02_sfnt_off00013313.bin
55d3066e743733130c8b8b45548cc8138a57f68b945d03ce492b05bbca289763
pdf-font-stream PDF embedded font (sfnt) at offset 0x13313 10468 bytes