Malicious PDF — malware analysis report

Static analysis result for SHA-256 6594366572a83d83…

MALICIOUS

PDF

71.0 KB Created: 2021-09-21 06:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 797a6b78c069c70fa8dfb851a7d80fd7 SHA-1: 1ae1130ed3fdc5adc79b923e46221a9da9c7ff11 SHA-256: 6594366572a83d83896fbcbcd0f8ac8f1446cb367669b8e297b2687cabbbb761
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=nizhalariyathe+niramaniyum+mp3+song+download PDF link annotation
    • http://thechitay.com/uploads/userfiles/file/debokupofikijanagoden.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20210918144744.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/40507240217.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/vukenilotujinani.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/45348910215.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/31eb430a779e6308867b70fc44ef18d9/25469641710.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/87891125961.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b5e8b0d3---61955166669.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/sezavoz.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/jefufoj.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380cfeb4aa0---96532587779.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/xemowenujoxezifigoxus.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/72901188870.pdfIn PDF document text
    • https://migger.dk/userimages/file/60137307410.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5fed65e2---vapumoguzigijewonoto.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/lusugonubukurupetevu.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/42282317301.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/tatovolumesoronususideti.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/40309332145.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/xamagobupowobudo.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_off0000b39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39D 11348 bytes
SHA-256: ab1c2e7f3f7469ec7ed5fe0b2415a196b6741e987dd6883ac8b48de0fb469336
font_01_sfnt_off0000ce01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE01 15556 bytes
SHA-256: 3f1ab88513089424fbf8cd59ecc18fcffd67a26a0a3b736c3f528ca56a3dbfce
font_02_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1