Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8604706579b196e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 20:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84701e4b7b0900544c4b7da03ee91230 SHA-1: 03b8717ba4390a0bf01b903c56765eb2614b20c2 SHA-256: f8604706579b196e8b5f0f44aea6559e0599c5945ebe861a7a2bbf606bb494e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gencshow.com/upload/ckfinder/files/9579182146.pdf In PDF document text
    • http://www.vikingmaterials.com/img/jekegi.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/80470025628.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613743035f481---28356161240.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/91748712358.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/93482562543.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/68451486500.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaafe6afc9---17805499763.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/jalirujedadenikoxasubanuk.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/47520538992.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/37371252889.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/40904732082.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/tukosibamo.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/96728773245.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613304bb44d68---rulime.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/jemofenuvomajotet.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/lugirutagoko.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/gejazobubideto.pdfIn PDF document text
    • https://plasy.com/uploads/file/60464966725.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/sefepevidu.pdfIn PDF document text
    • http://tochalco.com/uploads/files/xodivoberutegeripuvoxi.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/nadab.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/81502235426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=truck+driver+city+crush+game+online+playPDF 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_off0000d572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD572 18440 bytes
SHA-256: 0d97ad8d2851d11e193991d82c188e8060f2ab1adfde9e25f298501ec67a1ced
font_01_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 11296 bytes
SHA-256: dd98471054de85f98fa00a95bbe6e1b3879241bbde0b6a1896ee2f354bc3cd88
font_02_sfnt_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.