Malicious PDF — malware analysis report

Static analysis result for SHA-256 6822d74a90a6df10…

MALICIOUS

PDF

73.1 KB Created: 2021-09-20 02:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f651f8a9bcf388c2dfec2ed65ecacc62 SHA-1: 2b37461c524c4f7072974d7b0d2270666a56f3b3 SHA-256: 6822d74a90a6df10a6af43d2abc04b2f66cb2c57ebc9e4c016dda9bf6297cd93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and link farms pointing to compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious sites, possibly to download further payloads or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=download+racing+smash+3d
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e45a2f65---10983059260.pdf
    • https://firmabudowlanawalczak.pl/web/uploads/files/31019311682.pdf
    • http://alexlunacoach.com/img/editor/file/kowozovut.pdf
    • http://pwr-tech.ru/userfiles/file/xipujepokobo.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ta6739fa5g4g0lobl827bgfu2u/rirowedotizuxariludalexa.pdf
    • https://dermatologie-chamonix.com/userfiles/file/88426782145.pdf
    • https://charlesstreetvideo.com/userfiles/file/pumixevexomovolizi.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/66161338765.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145e712149fe---jekivakufijivoxurewate.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6927092fe---butuzevapalogivamiwebot.pdf
    • http://www.herbertvanderbrugghen.nl/draft/nomuli.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134432b22832---tuboniwabawis.pdf
    • http://teamhead.net/userfiles/file/finefawexik.pdf
    • http://irvine.songhakbbq.com/uploads/files/9045315772.pdf
    • https://pcparts.fr/ckfinder/userfiles/files/zasebazotosuwaxokexe.pdf
    • https://mobilieroccasion.fr/uploads/file/54317655400.pdf
    • https://dansobentre.net/uploads/file/sisijadisiwavap.pdf
    • http://slovbau.sk/test/userfiles/file/62134597679.pdf
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jilulalevofa.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5b837a8dd9228cc29b2ef724bdc1c2c1/mojaguliwogedaxefumivok.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147be72e2c5c---nekoxoxub.pdf
    • http://innospectrum.eu/hirlevel/file/93896284647.pdf
    • https://ibshospitals.com/userfiles/file/86863310172.pdf
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/3377325573.pdf
    • http://costruzionibulagna.it/userfiles/files/58389687508.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_off0000bc7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7E 16792 bytes
font_01_sfnt_off0000d490.bin
b12911624d3a434a0ec7fbc2bafb0e49cc2006c1343cc11247ce0ec983361e17
pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 16340 bytes
font_02_sfnt_off0000fdec.bin
26399a1d36ba7445c65f85afa099bb1ee88e18b17a60c2f54f541806ce8c7253
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 10844 bytes