Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e1dba603adfe6b…

MALICIOUS

PDF

89.9 KB Created: 2021-08-23 12:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e27fd8b2691c25a1f3eda2c6bfe1007 SHA-1: 8e04eb1026f28f9caab0f4a490221d363373536e SHA-256: b3e1dba603adfe6b68af926746160d9d7af73f61e1c493ed5c66ba3ba8b6bbff
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://climacom.eu/userfiles/files/55419117457.pdf In PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071323d21500---94226453205.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160844b6cc4c9d---14157611245.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/kutujenarojenufejawate.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/parudawinigivubima.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a92cb786---rexesorusidebozu.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/59348419410.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///xexavisurekupexadibun.pdfIn PDF document text
    • http://nktrading.qa/file/files/jumagedomewit.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/vawutujofetusowikaw.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/43910574465.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/94580017438.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/dumejijanipum.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b7f4a9a2927b3d9be9abb5abfb05355b/dinimo.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/819ookf37lg72047shaqfgsl43/kijad.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/rafinaxitedolinamaxiz.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/33053983330.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/wolezobaxowonabomad.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1bb0b33cb---zinivavikaponixenal.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1629407878.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607901ef15b8d---86555129426.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/karezilokededikabuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=quotes+for+being+sad+and+disappointedPDF 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_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11512 16780 bytes
SHA-256: 263477c18bf11cd9eb0d8b2b4d669809d308c2f268d7ef370c7634d9befb22cf
font_02_sfnt_off00013f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F89 10924 bytes
SHA-256: ddd1f7218686fe2223681dee4609da98d9e521b49e1ab1e1341bd875360905b4

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