Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad1af298253e872…

MALICIOUS

PDF

73.9 KB Created: 2021-07-28 05:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2848fe31f929039dbba25a62e81ce4a SHA-1: 287ff70645f635b913b0e8758f5456c189efc07f SHA-256: 4ad1af298253e8728eaede52123097653e861779b2d4bcca88bf19d81b10b8e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and other domains, likely intended to distribute malware or phish for credentials. The document body is heavily obfuscated and does not provide direct textual clues, but the presence of numerous external links and the heuristic firings strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ijp2.com/contents//files/fodelikefadabuvunitu.pdf In PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/63405916499.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/18308424180.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/eeceabd3797aa7ba96ef948fa24c5b98/25155634899.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/64536297645.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/dd40d9c52e5567b55a77cc39b468ee16/15901311276.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/18010382754.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607755b748126---13868345213.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/52699758698.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/32325626817.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/95405485604.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/cbcbf0c0449d120ea09c833857be98ae/welatosaguzisekikam.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/vevizaginedevesekolek.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/21470897268.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/fb9219331524031b8282093fca83c63e/lelefikotame.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/bukowuxibopulegazuxozito.pdfIn PDF document text
    • https://campermagazine.tv/public/file/76039638477.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/vipalakotudotomagan.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff09a554d---73360837327.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072419f6bac1---zowazapipojevilugo.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe942fe76---69337101111.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/54998006653.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/kuzoner.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=writing+chemical+formulas+worksheetPDF 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_off0000c044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 11056 bytes
SHA-256: 744c4c65386347e2895a2fd94b81c9e750bc3e51ee07680b6ed6cb89d08224c8
font_01_sfnt_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 15544 bytes
SHA-256: b2d1e45a29322b41007b4f7827d635251d8df1f32d18545cf326eab70d7866ab

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