Malicious PDF — malware analysis report

Static analysis result for SHA-256 008f8571fe5712dc…

MALICIOUS

PDF

78.4 KB Created: 2021-08-16 02:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a410032c2459b21b64387bba509e443 SHA-1: ec9ee97a089fbb102d3cf9011a0467f4d595e31e SHA-256: 008f8571fe5712dc89b8406788575c7a4aaeda24bef5dd0d946b1869b201b64b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying a pattern of link farming on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://philabc.ru/uplcv?utm_term=ielts+5+practice+tests+general+set+2+pdf PDF link annotation
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28498bf2eb---jiranavejapofesuxilava.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/61917333483.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d4cf01b07---4071071524.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/309c470f464dc34b95f246433ec6e814/zubuviko.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/19282252220.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/35548546697.pdfIn PDF document text
    • https://mahae.hu/files/files/kemavubugitadig.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160825f082ab36---95330968265.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/8c3869ef4faa69ca5140be9789f53927/52777928971.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/abf89586a08331b35eb02cb262a28b0a/fofowevi.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1098a8c40d1e4c270e89e3836379a208/razuxodefosudi.pdfIn PDF document text
    • https://ccskin.com/geektic/files/wowajavotuzevadiladibobap.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d6dd8747---71981811381.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/39156672150.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/zetewibelijapofagevulu.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/6473835170.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608194f532f56---naxajezekebebibabonoguri.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ddb23ba570caf821c37f87fb7d04e551/10821960933.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd545280434---jedakivofa.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/81894636811.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210710/file/16258650596843.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f2154cc1b---paseramisavof.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa603e43428---48265387103.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/wukutefefamafenoxa.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/43704189284.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/94507211207.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c5306ee1d5613f892c3de8310600cafe/wibisotefafago.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85C 18864 bytes
SHA-256: 7f6af96f2b3bb1070ba2a553e09b102de149d5830a21f813ba11b23263ee6261
font_01_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 10880 bytes
SHA-256: 5b5751c67e74a09fb98f9c6ee1a47bd2353b7be5bf26f3270b5802185c7e3953
font_02_sfnt_off00011169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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