Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1ebac2e445208f…

MALICIOUS

PDF

113.2 KB Created: 2021-07-20 07:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55430b072b1cd19c5b50ca0e8bd9e6e0 SHA-1: 5af59306b37ce6f57a6a242ef1388b4fabbc452e SHA-256: bf1ebac2e445208f28144525b5003bed42dfb20dad44fa42a620427ced641690
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure and the presence of multiple external URIs suggest it's designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc73944b0---potumofesoweja.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2268a268db---64333789386.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/dafafikuzu.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/bidasu.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/87446391660.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5b9999a4bd1f214eaca8f448b9bb718f/butuvukulojunat.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1a270ab6f292cd190a6a5da788546cd5/84244566165.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/48flrqs0chl74nfarfsde63ree/parutisurawiwa.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2f1b1837a02dc470a11209092242eb77/61136794586.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8418d38ae---jutexefepifu.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/3592816402.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8edb0315b2f08eee3e55b5f8101a1a85/40582774785.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c2540a91---96859101138.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/jbv6uhdh9usid718oem3tktjp3/romudodawekexevotupemaxaz.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/samamavasironake.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3f069425---fofebebedisunezam.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091e9f4a4d4b---63591904056.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/mipezafanijirepoti.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/d0b3f63bb154427bde8f50bdeae62391/mozefudevagigifuzepaf.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/neroralixumajedolabimufox.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/voj7nh550kn64sig9eqba2s0lk/dowewupije.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7c2b4fe3bee2d3e7d48a92f90a23ddcb/detajora.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4c51630a---vokumine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=next+to+normal+setPDF 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_off000152cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AE4 10256 bytes
SHA-256: 1c50f575b72d54aac2802e1ca83ce3344cf1b6b08efed8066d603605bf2d15c3
font_02_sfnt_off000181f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F8 21656 bytes
SHA-256: 17a7560983c24454985862e5e8db01e8b20c737014f5e0ea4ca82e9df2523ecc

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