Malicious PDF — malware analysis report

Static analysis result for SHA-256 258a679a08495794…

MALICIOUS

PDF

87.9 KB Created: 2021-09-15 20:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 164995ff030b877176a630456f8ae034 SHA-1: 7a9193ed9e678c4850eb180ea1aaf73f7cca05b7 SHA-256: 258a679a08495794d328a1d646f0b0b00a9ec963e7a271091c9f137913d9d82d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wegofa.com/userfiles/file/sitagatikosaxinuwez.pdf
    • http://architettosirocco.it/userfiles/files/suterimubepezumix.pdf
    • http://gonvvama.net/filespath/files/20210906110514.pdf
    • http://ferramentabelleggia.it/public/file/92736819003.pdf
    • http://eviljoy.com/UserFiles/File/99470623684.pdf
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/73938113733.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1009f7bc---malaramel.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb14cba99d---fuwopixigujo.pdf
    • https://www.nstoplana.rs/ckfinder/userfiles/files/91152880420.pdf
    • http://wagnerpc.com/userfiles/files/19729489436.pdf
    • http://www.premiumimport.nl/ckfinder/userfiles/files/5257707907.pdf
    • http://nieruchomosci-swidnica.pl/userfiles/file/51328883480.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/figanenuzugukemukumanoma.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/39056266550.pdf
    • http://probeg2000.ru/files/userfiles/files/tupokemaruta.pdf
    • https://pecsikult.hu/files/file/7550791546.pdf
    • http://www.aragonemprendedor.com/userfiles/files/47352902941.pdf
    • http://agcslohian.com/userfiles/file/99091769406.pdf
    • http://caratow.nl/userfiles/file/mekenusoso.pdf
    • http://bilateralmatters.org/userfiles/file/68081671844.pdf
    • https://kokomanis.com/contents/files/7800659413.pdf
    • http://tcgardening.com/userfiles/file/2021091404033273499.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/06949c873e6db5cedff3b5d7fb6b6ca0/resuxitafix.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/wanuriwadunibiwajasowul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=soul+horror+movie+2020
    • 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_off0000f1b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 16792 bytes
font_01_sfnt_off000109c4.bin
d6b925cd69a14e8ade1563b038b0c1b5be736c7aee9a74100b52a1dfc6018e2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 19040 bytes
font_02_sfnt_off00013aff.bin
fbd4c7f902cc02cbf90cd8ed8e8cdd359dd2d1d27889af79a7a33f49f0336151
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFF 10324 bytes