Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf6cf817a2763f0…

MALICIOUS

PDF

74.0 KB Created: 2021-09-26 04:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc84e1f08da8652ec0c512c485638e77 SHA-1: 2c96881f2b816b7945413228af5f54751ceec54a SHA-256: fbf6cf817a2763f074ac91874146604410de225f4dbd2923f2df26b0378af7c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to potentially malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=pokemon+omega+ruby+rom+download+for+pc PDF link annotation
    • https://mobilieroccasion.fr/uploads/file/woferejejetozoxirasipoma.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161430d531ae80---72064006066.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/kinabudevomibumixexe.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/34214657026.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/98081201006.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/xutugarulidufujelono.pdfIn PDF document text
    • http://halmar.info/userfiles/file/kegexudinedusewi.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/loxezekibu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb36121f01---lexotatobaxubal.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/14063527186.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/93c964cd9529db84dc604c3c8d0f4133/vetiwibefutubabijapabi.pdfIn PDF document text
    • http://juentai.com/userfiles/files/nejowudogo.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/kifabusoveb.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/dibopivaxerujevirado.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/84052405065.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/lerazufukefumozeluvido.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/lalopegiwovaro.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/bibega.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/83346550276.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2612dcb2---6392676241.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eab54007de---bigilirimawav.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/006e8401920a940dc3b542ca50d97b4f/28927730902.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/borozasiledozawolil.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161307ecb8cdc3---2697401907.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/72163482278.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF5 19628 bytes
SHA-256: 99d4a12dd10dfe376312f8a88d3454af552b618960a19ba8516ca819361c621c
font_02_sfnt_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 11140 bytes
SHA-256: 7e9e454e452dfa766469d3cdaa46323ea1afcd6afdd869958825485771d0e212

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