Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30cb1652acdb5d0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 11:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8489765ad7c3e19acd2bdb57dd76121 SHA-1: 98ecd483a42fddb4ef72d9adca6c86b76a47cc6e SHA-256: b30cb1652acdb5d0503e5ea1e7803ba1fb2e90b7ff0f8631a40377818cd8b163
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The embedded URLs are designed to appear as legitimate documents but lead to unknown or malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa752988bab---bepodutasubexevepi.pdf In PDF document text
    • http://asja-doll.ru/userfiles/file/nojesudegude.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062717013770554.pdfIn PDF document text
    • http://thevale.us/userimages/99694481435.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/dapowoposizaragisesuvaf.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/metotare.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/ladagazaxurejumu.pdfIn PDF document text
    • https://comfort8889.com/upload/files/jasixugamopadefabow.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/524651171e3ef7129df9eb17c9d2bbbf/97537182352.pdfIn PDF document text
    • http://llux.vn/uploads/files/30079757361.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/99200193550.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/62831766011.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/81122296669.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/29671403028.pdfIn PDF document text
    • https://tarsiman.ee/files/file/79817299302.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/jopuzuwukaw.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b836c55b4652ab1cf87bbbb958c6f3ed/48997419229.pdfIn PDF document text
    • http://coffee33.ru/archive/file/jifoguvit.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/rekajakelumofogup.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/sofetifapizepugutatezu.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/15339441760.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/rirujokisadufezananepeva.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/24a7d252fc303a7ffea03daf4ce4bab8/58981197693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=honda+pilot+2012+touring+user+manualPDF 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_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 11120 bytes
SHA-256: 609dad08f0a9471f9563d745fb277c1ba84391c7ffa27be4fac092307de090df
font_01_sfnt_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 18068 bytes
SHA-256: 894fbcd9b01f7d534e92cea58cc4c3bfe88cd6d3c5aa574f1ba0b4afd895f631
font_02_sfnt_off0001284f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1