Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8214a594dbb8e2…

MALICIOUS

PDF

87.1 KB Created: 2021-06-25 15:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5d890f271ad5314816e3f5744473886 SHA-1: bca4a7b42710253f3849c59dba4df056b2f7c34a SHA-256: da8214a594dbb8e2ceda9b22af5d4ce32375227472e71e28826d713c5412cdec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains, likely to lure users into downloading further malware or submitting sensitive information. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=attention+video+song+download
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/621d660ba63b5e01da1d1ffc8aa2432f/zutopunavanomatexobexudi.pdf
    • http://irk-yoga.ru/upload/files/demewimomiwufixekoluxad.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bea31e0a3a241877e01b03711acd3235/mazin.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcff728a96---bupujamagomejufinowofokog.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/053499fe4c12151ab39b3a7e57d03712/70821587037.pdf
    • https://tectrongim.com/uploads/files/litedumuk.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836babbc538---pelamixomibafisivosuta.pdf
    • http://op-gold.com/ck_image//files/bomemasaforadozejaxebabek.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdfacc0ff---3458117738.pdf
    • http://www.hussco-steel.com/husscofiles/files/vulakugibutekisu.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7ebcf32165a0f22eac54d14016285559/kekepitekavaxibozabaruzew.pdf
    • https://volnynaklad.cz/data/file/22937824844.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e5f62685---88197228245.pdf
    • http://ekolojikweb.net/upld/userfiles/file/xafijizufexejexezeguvidiz.pdf
    • http://kochamsushi.pl/UserFiles/file/sapiforofavafil.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/03vu75m5fph4n0ot8od53mi2m7/97462659729.pdf
    • http://syuncyoku.jp/upload/file/juxura.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 16792 bytes
font_01_sfnt_off0000f3e2.bin
55aad3d58edae35df5bb026a679edc07434ac54d6d0f0ada52a13eabc8e81d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 17060 bytes
font_02_sfnt_off000120a6.bin
85bd2536916d4b3a479e4fd07017fa968d10ca3c338094c9ee50d0d51d27cc07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 16844 bytes
font_03_sfnt_off00013751.bin
c4ab67bd2e71df0ae817d352ddc93c5d4d1c0563050b3d9c20eda1a86748cd64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 10456 bytes

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