Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc675012b6a80ff5…

MALICIOUS

PDF

68.1 KB Created: 2021-10-02 23:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 42b13269a1674f2cf4bc75241d920af0 SHA-1: 7823d7ec1a1b8c793ac757cec0dcb7ab8e9310d6 SHA-256: cc675012b6a80ff5301738b9458106e23a2d6d2a3c584050389d6f4cb9dc8b9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://catamma.ru/uplcv?utm_term=three+letter+words+ending+in+g PDF link annotation
    • https://elitstroycraft.ru/source/file/keponijawafeti.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/41931667581.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kejofe.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/tawuburawokojojob.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/78762503799.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/wolatosakute.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/walududuta.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/89213585598.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/eeqvcrq1obi4it3ma35il45m43/39954143925.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/nerome.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/xetalakinuk.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/kogor.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/maxejila.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/14087015193.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/28209716817.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a6faffc04accd6da81ff741606330d97/83694662033.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/80483800833.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/pelulapenokobi.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148be00e657c---62350058115.pdfIn PDF document text
    • https://cecprint.com/images/file/63896715839.pdfIn PDF document text
    • http://sushibelovo.ru/files/xiwikaniropi.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_off0000ae0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61E 14924 bytes
SHA-256: d9644fbbd8f26d7baa601cb3f8d642072016c8421fdb43b6038993d72521ce06
font_02_sfnt_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 10412 bytes
SHA-256: 1c0f81df0ec3e221e570c6e130b8ae21bc728e06ef2ec4bbf25a517958241df1