Malicious PDF — malware analysis report

Static analysis result for SHA-256 726db8f1c27ea44b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 16:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05f2c0908cbd42f1a80c2340a104320c SHA-1: f28388ae5854cab83ffd5d62ea2331d179364ae2 SHA-256: 726db8f1c27ea44bd3d6075dab91abbc2077c77d0bc75ab588a1479b8f03b221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the presence of external links and the overall detection profile indicate a likely attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=short+story+structure+pdf PDF link annotation
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/giwiwenoxomivided.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/tunuxonoxovepakigetomatoz.pdfIn PDF document text
    • http://kdekdyjak.cz/data/81633260370.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136060ab2344---77778256023.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/5478811797.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/naviv.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/duxik.pdfIn PDF document text
    • https://ambalatender.com/upload/files/xowasajuwoporatekedo.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/21833242072.pdfIn PDF document text
    • http://hanifeugur.com/image/files/muboretikodaj.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///gefavarimit.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/47192251412.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/74326722705.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/1905801466.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/pajijaroso.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/16789518257.pdfIn PDF document text
    • https://photofetimages.com/bewawevisidupejefule.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/67900272872.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/80913420454.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c155f6636c80cdfa4047271cee27ebfb/jutejozetup.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b1006174---89387410567.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/mejiwisavilepomenutosa.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_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 10600 bytes
SHA-256: b0d7d6a840bea654ebda33e0a2bcd7ba8b6f2f65572880b1c170315117f710bb
font_01_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 18116 bytes
SHA-256: b257ead768e32cc6c1c6b9aa406f0834f8bc48c0c8ef1bb70b473737748e8461