Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ec19dac6ceea94…

MALICIOUS

PDF

73.1 KB Created: 2021-09-19 08:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2475ce706d1eed9317ed88a0054e2062 SHA-1: 18a5586be762f06effa3b300b0cc5c3c55fc0618 SHA-256: 50ec19dac6ceea9415e600c858947fefca2bc8e9da254653af9e2cca2ed14229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier output point towards a malicious PDF designed to exploit users.

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://krisoc.ru/uplcv?utm_term=western+sniper+mod+apk
    • https://pomtco.com/technical/files/file/powinegifupekubofawas.pdf
    • http://s2ipower.com/survey/userfiles/files/zasujulomuxugububad.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdb1ef2ed6---mepuxipasegajumusubo.pdf
    • http://gemaeldeundobjekte.de/uploads/files/puwelekedekujuvadojetelon.pdf
    • http://mimarkamilozkartal.com/userfiles/files/sabopuzedepol.pdf
    • http://enricobarraco.com/files/48517600338.pdf
    • http://ck-buhgalter.ru/userfiles/file/wonaromolapeze.pdf
    • http://elosc.com/upFile/file///ITX202109042220532539.pdf
    • http://clingac.com/d/files/95249630473.pdf
    • http://axwelindia.com/uploads/69689803219.pdf
    • http://dagmare.de/userfiles/file/galawetemizafaribewe.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/fosevotajiduposu.pdf
    • https://garnizone.com/userfiles/file/tevoramiririmibulivujikul.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a2d808ff---60736071758.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/baa9da22b3a3dd19ae4a6be4e746c27e/goduli.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139f55653d79---66207638972.pdf
    • http://streathamtaxi.com/survey/userfiles/files/mititu.pdf
    • http://rulife.ru/ckfinder/userfiles/files/81740919022.pdf
    • http://poaglasses.com/uploads/files/202109060918368225.pdf
    • http://szilasfood.hu/pic_upload/files/dawezisaxavi.pdf
    • http://kleinschaden-expert.com/userfiles/file/1914173970.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/59953317088.pdf
    • http://gesht.ru/admin/ckfinder/userfiles/files/1494977455.pdf
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/81193941430.pdf
    • http://novena99.com/uploads/files/202109101805568456.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bace.bin
b999bfc2cffa33695e812510c3d8bb019b0e43222002e6d6b9ae7948a8d5b7ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xBACE 17020 bytes
font_01_sfnt_off0000e6e3.bin
aca0e67b711e3d67b8fce367cddbc81350ad37b2f147a333a1373898da362e78
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 10592 bytes
font_02_sfnt_off0000ff13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 16792 bytes