Malicious PDF — malware analysis report

Static analysis result for SHA-256 039a6f9b576733aa…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 20:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9be16cd09644c6a065ad2bfd6b2c5d81 SHA-1: 88c3ceba65ab07c9f9f0bc014610db869ebac19d SHA-256: 039a6f9b576733aaf49d7d058df0efa2257ab49096570678dc37637a593bf975
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082926573ec2---98132737030.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4eba8e7ec---37035254884.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/39296033735.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/butorutejazo.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/sogepezifavanitovuvuvazop.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/80311743881.pdfIn PDF document text
    • http://elitvorota.ru/f/file/90604230349.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16113651daf403---paluzedos.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/2432055935.pdfIn PDF document text
    • http://www.77ice.com/upload/files/batipobul.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc8b7877ec---25961042928.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/vonofozokezat.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da38758182---16794513809.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1477c4c996a060040a44da1cbdbb675f/94791735533.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a906f432203918c13c1b042d86e5b39e/70871247475.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/15620374286.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/55401156923.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/48619138681.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e07a8e125---5651493216.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160808fe10a469---84245762663.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/lofirawolag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rich+dad+poor+dad+pdf+redditPDF 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_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 18052 bytes
SHA-256: 81f8c687c11d5139d857f25cff26f851ebc37332ee63f82c7a416b56101ece6d
font_01_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 10444 bytes
SHA-256: 94d1558a4a5123cd123b1815dd3fa88a134a3a2f767d5f79cf9f9d48547c202f

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