Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7449999ee79828…

MALICIOUS

PDF

73.5 KB Created: 2021-09-27 03:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c4f67f680814270035bad187fbc23668 SHA-1: 1797017f1e7a538be05bdf3ed9f7382ac7c4ccd2 SHA-256: 5a7449999ee79828d7bbbc2b0f1d76b705db4f9b41f8d822af857de81e7c08b7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of numerous links on potentially disposable or compromised hosting suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415a4430c61---18973603980.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1614190e81ba14---vudav.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/supajuzavobanowip.pdfIn PDF document text
    • http://kaies.cn/upfiles/210908182825272930p1kwgm.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/futakebewekodotosotepa.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/vazuwusosud.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63350824320.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/93283383924.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/10369692108.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/8550413196.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/garav.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/pejuneb.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/juwusozufofegaket.pdfIn PDF document text
    • https://miminku3.com/contents/files/11434447392.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/27411029342.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/xuvasiz.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/lugefogomo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149be5707df1---90608074955.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/9950270859.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/nonovuzaxupotutebaponani.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/58882480103.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/weroxegipunopuwogureban.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/nosimo.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/palekokigag.pdfIn PDF document text
    • https://produse-zilan.ro/files/29925861862.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210911064202_vfrlt6.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/hflmpsi96phu2elch3fprb97hs/rexuxozebirujikuvabatusek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+navigation+app+for+galaxy+watchPDF 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_off0000b825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB825 17752 bytes
SHA-256: 578431708742f685e0bbb6a0fe0f14d5568941f825c8e13fe48a20674e624f03
font_01_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 10936 bytes
SHA-256: b7679390837f99f71802f52382c1fe03c5af59bb2e3e10d1371e68b68ef91e3d