Malicious PDF — malware analysis report

Static analysis result for SHA-256 130d791b452905da…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 12:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d9fc82ef6ab1912843fffc1e0809ebf SHA-1: c76a17f4491a8b93420c47895391aa2a8b47d631 SHA-256: 130d791b452905da2f6e0b822433a9397cdbe17d7ff071fc5dd4ee368f6fa3dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting domains. The presence of these links suggests an attempt to redirect users to phishing or malware distribution sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://giasuthanhdat.vn/Images_upload/files/serodefabagotisav.pdf In PDF document text
    • http://beveragesgs.com/userfiles/file/juxatituzobuwemugepuj.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/42038680141.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/96652525275.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/smshap96tppt6s1docedjq9p3k/53948458280.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/dirinivivarefunatiz.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/gonakexegasoka.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/43478606890.pdfIn PDF document text
    • https://sambelteri.com/contents//files/mined.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609580c7ed361---golomibufopofesaxom.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805287817aa---retajapezop.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a088faa61a5---vabijariwaderiziju.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/48045441976.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/pifubononebadexogajas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120e8995d9cd---70646134265.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/83448816839.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988ab6de274---12542218902.pdfIn PDF document text
    • http://dztechfin.com/upload/file///gavesirefuvazaxusijuvamol.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/glmonkg6htnt3pfhgri4u4gdle/97730805748.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/xoxasu.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/xosadovitojupewi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083f05bb02be---59155367991.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/74696646286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tratamiento+trastorno+antisocial+pdfPDF link annotation
    • 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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 17960 bytes
SHA-256: 3d39849e7861a693378bd62aecaac7ad85ff11023ed6615c51817f7cd39cdeb4
font_01_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 10744 bytes
SHA-256: f9c5cf5ad3c66b7fa794a179b321c452460756f313377baa4394bb7baa287acb

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