Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e505f9913392097…

MALICIOUS

PDF

77.7 KB Created: 2021-08-21 21:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6af598bcaafcef1a5cfe7b92030cd254 SHA-1: a59ea2f4fecc3d3eb842ed7d1d282bb488b0f7ea SHA-256: 3e505f9913392097a19b6692900cfb0b78388206e8ca774452ff7d89b81849bd
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=operations+management+nigel+slack+9th+edition+pdf+free PDF link annotation
    • http://inwama4.vn/webroot/img/files/94721196017.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/64590074386.pdfIn PDF document text
    • https://tipresentoio.it/images/file/31413566220.pdfIn PDF document text
    • http://sartor.ru/upload/files/logutini.pdfIn PDF document text
    • http://whatdwellswithin.com/file/75692551253.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9446cb96dc033c1f2f28ec527c1c07df/fuvedigibutezo.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/52990325842.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/70717284167.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/23046657249.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bm8oc27b6g0d0mm9eq1ae11f16/xumekemozafuvepiwe.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/tujagot.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/nonetagiradex.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094160983d5c---jozalaxisurozolavojoku.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d3e3dd8d---nixewuzokanej.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fe5abdec---tuxowugorafesif.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/vowobevagugakolabidi.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160cae834d56d9---82907631482.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/fotelowumedilevuzezos.pdfIn PDF document text
    • https://media-get.com/userfiles/files/54225206985.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/24924662599.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/84728816924.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/n23tkevmro0f29gnug5r7qm1nu/jonijiluxifevatekafuse.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/xedinavusodinemakurilikud.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609886373525b---fetuxesojo.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_off0000c9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 17156 bytes
SHA-256: 49557373ae49af2362b62b800a838132ea8c37a7d559de69c59057595cc7025e
font_01_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 11352 bytes
SHA-256: bb761260dd8980a8032d2b8ed19ce9374edaaf908f34e2e5f4216d154765e47f

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