Malicious PDF — malware analysis report

Static analysis result for SHA-256 771c49a4495fdd4e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 08:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e03dd53dbbba1c1d756e8d5a1a506ef SHA-1: 668979fe7fe73c82a4cb5d11c4bad376f58f0ddc SHA-256: 771c49a4495fdd4e372ccecfeae59a002799ff1b768dfeced3df9825bc031552
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document is classified as malicious and exhibits characteristics of a credential harvesting lure, specifically targeting multi-factor authentication or one-time codes. The document contains numerous links to potentially compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute phishing content. The presence of multiple PDF link farm heuristics further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://okna-dvere-online.cz/media/upload/upload/file/mivexoketum.pdf In PDF document text
    • https://rajaunited.com/contents/files/65949525364.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144948c8971d---vililikiwurapovovuran.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/wevejugiwotisotugofewite.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/88390922865.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1cf11b6b7777b05eb89655ee7b470682/66939008389.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/81670813803.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/727184033a1d005e96b11a856f96d64a/kawigedirusabupepifav.pdfIn PDF document text
    • http://chengzechem.com/upload/files/20413028828.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/lujef.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/tudanebe.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/28073880705.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/7650292962.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/lulonekizozalaxexukej.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135dbb5b1a09---45246473575.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/77699045249.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/22091169328.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/kezakaruzovefarafonisarid.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/98926864069.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/23829020597.pdfIn PDF document text
    • http://smirna.pl/files/file/9392958796.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/vajipotur.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/giwafuvokugupotun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+send+a+picture+via+bluetoothPDF 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_off0000d596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 17024 bytes
SHA-256: aa9bf42e1ba1feade8d13ec6fd1db3879a096323d89c827c44ced4159405e614
font_02_sfnt_off0001197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 10996 bytes
SHA-256: 899f5b429b26aec6eb36728053bc2fe66a7cd8e1eb032a53ca97f74dbd26bfde

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