Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b8e5a6b5bcd5d0…

MALICIOUS

PDF

84.3 KB Created: 2021-07-14 01:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4ed82eb69c2f7514f24b1f6b297a295 SHA-1: d20bae91b836ec0a4416eb388274dd1530da9884 SHA-256: e1b8e5a6b5bcd5d055774e407abcf3306f7ed719198ea118d442d4165dc0c4a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it is used as a link farm to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=games+like+clash+royale
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae13c96b71---4587459804.pdf
    • https://kermoulin.com/userfiles/file/putitugimogepipitag.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eaec5f683---78356068445.pdf
    • http://crystal-lamp.ru/uploads/files/89743610132.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb643633d---pebopov.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608807b335b6f---nazob.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b881644d844e6f3fa5dcd6e430cd7841/58277872730.pdf
    • http://geologicatoscana.eu/userfiles/files/nixovibupepunibidodibagik.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be45742903c---93479241539.pdf
    • http://wardwrightself.com/clients/863644/File/riral.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ce3e2c0f04baf1e7e9d504930c6aced0/nupupemiwuvikafokeluj.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/sidavapikowotuf.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/49922049365.pdf
    • https://krono-original.vn/Images_upload/files/98397379123.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6549a2d4d5f952e408b10d86557b4050/47844543143.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72d33c859---defale.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/nt27j8tha8h6sjchf6ij25vgv5/6806710484.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210708114654.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b92fbb090---nebewokuvexib.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094b076c9c75---43028538439.pdf
    • https://nepalonetours.com/userfiles/files/66813826043.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160840906116a6---36388908049.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5d6d8e26c---66705969630.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_off0000e8d6.bin
8322fc191561f55fd155a4a9e986ee2cce49ad7a370630a3901b40f0747d8a4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 16608 bytes
font_01_sfnt_off00011424.bin
54ecc856134d9206b3fe155b876c7fc843cc15fba84538454c827ef0d93a3609
pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 10536 bytes
font_02_sfnt_off00012c2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 16792 bytes