Malicious PDF — malware analysis report

Static analysis result for SHA-256 457dfe70d71c59a4…

MALICIOUS

PDF

71.1 KB Created: 2021-09-01 01:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df239fc368df3964afaf2debd6ef5a0c SHA-1: fa03d7719c3580b5e09867c5c7af5826436dc3f2 SHA-256: 457dfe70d71c59a405f8c2445de875e8b755d01edd57cb1e6022acba3ab69ca9
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classifying it as a phishing trojan. The primary attack pattern involves luring users to external sites through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094806f67d5d---vebexumonofujenaxujo.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fad7e74e67---82576403978.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/86495224540.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/navet.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/wewamewifudotebebatuju.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/33999991121.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/10f13b81e96c6677aae831d714ab3434/forizotup.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/49229948407.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/pedesunagatozexinituzegok.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/puzelomewuvixazuvixuzibe.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c010f59574556c91ca3a9a07879809bf/gatokupe.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/4403133895.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/mukixofotugelevof.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/nifumugupotabujuro.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/lizimopapebanaf.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b728599c5f8---kugomizom.pdfIn PDF document text
    • http://sdds.be/userfiles/file/gazozevazijavebaju.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3303416b---39815456766.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/vafixupotovelenisez.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5770b79152---xipipojavazodojemov.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83108cdaf---mukifagupinukimolebuliv.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/56540004052.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/97821494214.pdfIn PDF document text
    • https://dietacud.eu/upload/file/64383614619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+see+private+account+posts+on+instagram+without+followingPDF 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_off0000b802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB802 14728 bytes
SHA-256: 4cb6652dcd544177991ca07259ac42b744bb3f153fd8b5383e34dbd6d3043d53
font_01_sfnt_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 11168 bytes
SHA-256: c0180b098445e875397da37f202b7730481be3e49b9e02fe96e7fe4c670fb3a7

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