Malicious PDF — malware analysis report

Static analysis result for SHA-256 289a5c65702374ee…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 09:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2510446b75ecee6458bdf23031086e11 SHA-1: 672b1df44578b62ce80fb73d30a22c87c3d029fe SHA-256: 289a5c65702374eede6acfb2e6e4e2bfc953efe73ac8093d773c288811400e62
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, particularly those hosted on compromised CMS upload storage and disposable hosting, suggest an attempt to redirect users to harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://vegman-kzn.com/ckfinder/userfiles/files/vojogukajig.pdf In PDF document text
    • https://rabudiagnostic.com/userfiles/files/45183271503.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/xerejulijimejedikedus.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/rosigope.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210911082132.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/jukareduso.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/jilaxepulalukevil.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/53301619683.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/48355301587.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/xurigemizewu.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/7965410581.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/xotetoxafosumukinam.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/rafoxadixewetorovabu.pdfIn PDF document text
    • https://sitarasign.ir/data/file/xafiworufe.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613489d9a9439---tosit.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/53277782306.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mugotafowik.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/didiwagogujo.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210915_231440.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac9c1585a1---sulolugemug.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/19700321594.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f98ba0463c---85618710898.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/babafabi.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/wizoxipazeg.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/kewakipejes.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/wezuwirududedenamoledetif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cinema+movies+apk+downloadPDF 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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 18164 bytes
SHA-256: 1407d922012126dd9124a2ec176120fff9b36b74ad4a0f83c3a74cd94d8bec1b
font_02_sfnt_off000122b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 10632 bytes
SHA-256: 6a3c57ec96029be6f846169fad6ed758418fc9af2e1759e8d7ea0704836ad48c