Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7eb15da84a0c6d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 03:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05863fb9478d9d949c47b5215cc38148 SHA-1: 3fb1dbc52609d781179ddf94831bc56dcce6b236 SHA-256: 1c7eb15da84a0c6d4832a403a3c0c0d3458086ecf0f5aa4b868374205ba514db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous suspicious URLs points to a redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://magrubber.com/images_upload/files/45389153624.pdf In PDF document text
    • https://eyetracking.pl/userfiles/file/bobebisasazurubunu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1ef7a28e2551c21af0de236bcfcc4cbd/butojugomosawuruga.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7hdcp7lo5fpe7uma5luao1181n/6812542371.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a19906ad5---35757171451.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210612_040659.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/zujisu.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609613ec20d58---wuluvixuxupoxajafuk.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6628cd7b4---37043983480.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161356510e223e---pizitinajope.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/zesepenerojawi.pdfIn PDF document text
    • http://philipsphotographystudio.com/pifajotujukul.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/refelajune.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/095d33743ab954d8e18ccb878222d446/duxupepekunaraxusiwofad.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/lotuxejo.pdfIn PDF document text
    • http://arslanemlak.com/E/file/bupotedakutuvasepozubuzer.pdfIn PDF document text
    • https://kawanmto.org/contents//files/pefebezabumafexotesimoga.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/sodirapanamisagilaji.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a1f5db13a---sukokiva.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612550949d3e8---41220323645.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/nazuzatimivefe.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/90902644510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=genero+sexualidad+y+diversidad+humana+pdfPDF 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_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 11088 bytes
SHA-256: 59821530622eb977412b19f8922babbde6744ff4199693ccc1d6db70c3b9e011
font_01_sfnt_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11126 18552 bytes
SHA-256: fcf98fafe4c011f0a655b317a9df93c192cfbaae9c9c9fca30aaa4c5e2d6ff73

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