Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a8ceb1c9cbc652…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 19:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52814f3c4326bab86ce02b2ec8575b11 SHA-1: 80ebefb9f6c40923d11e467b4a9a8243dd5d5529 SHA-256: 82a8ceb1c9cbc6526a274e7f4c1d44764fa39fd9cf04c517672f159f5e5aa9ef
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The structure suggests a link farm designed to obscure the ultimate destination and potentially leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=grade+11+maths+functions+and+graphs+pdf PDF link annotation
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160763add5471f---94672967248.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca16822033---48637546767.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/64018270764.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b2a8d9781---8318198399.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/16315f9108d7d60f7f82b46e645e580d/69052592934.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/58d978f869bff5ee063cf1b772520cf3/52064386550.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/318991909.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec89ba98e---5843596403.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/gebetijopuxepuzufupa.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/xidikawokaselun.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/fekefidu.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/63509e3d38d0b3c704bf22e5127fa40b/78998556572.pdfIn PDF document text
    • http://momsystem.ru/public/file/97289750522.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/wezupogepowubuzusufi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607076086f06a---vujefasubemewuketizeb.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/01a5c057ab352251556990a80be470e4/13698883504.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/nubiriwubobabumogugurexe.pdfIn PDF document text
    • https://etimes.mn/uploads/files/24619658009.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/jejuxejul.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/1105cfc3f223f3f709fa5fed1604b49b/33048952369.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/vetelidajipakobiwizojamow.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/b3i00sp10rgd2r68srfl4amu10/xavabegubuzodusubatitu.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/94971159281.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/pikiwubiwem.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_off0000c1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D0 16924 bytes
SHA-256: 01c0221478604461e95dff9ca747814186eeab35460d2e08324ad55e1353382a
font_01_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 11212 bytes
SHA-256: 83b91396512e59314fc71084b850d09d186e343a68b50de642bc5cfe6e741fae
font_02_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.