Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9722c8500fb7212…

MALICIOUS

PDF

84.3 KB Created: 2021-08-10 03:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 82fcfb36482a792542bae790583fe852 SHA-1: 189e2e1b9977e36323de01a14d5ddb7c30b7fdf1 SHA-256: c9722c8500fb7212a5a772129771e574cf9f8948a5af0428d3bb1c41b63eccc4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the ultimate destination or leverage malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8be7853c830d50af369d43fdc5f57dd3/60629893038.pdf In PDF document text
    • http://travelshops.pl/userfiles/file/88581283492.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/94536250744.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/pewoditulolabozafedo.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/tobise.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/mekesatijapinovim.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/7757910976.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ds5scu17nhc1dmda0eoap6vbc1/84062727883.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d579b03570---boziwufobejemupozujubi.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/74830440045.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b022552ab3a---45022172277.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/nowasama.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f2e55fcc8490b3d209f0830798cc309d/lozepunolob.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/fufisisijidopadad.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/e147874c5713d757e6275974fd9f0d3e/87612643817.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/16887573601.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba09b7a73da---xaradibid.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7c365b219777acba6f8bd220602c0878/33177214672.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/paralozamagifajomitafab.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/57290641758.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/u10tnf3h2umh857cv59np3h1lt/zufirexijimiluvutamugo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/869468eb49aa33f968d9f38a02a96b01/ravuzuvoje.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/kunutewuwafulisajitepotag.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/foranojigise.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/tunazekokuzovigobamup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=encantadora+de+beb%C3%AAs+brasileiraPDF 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_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 19908 bytes
SHA-256: 665498563246058c0d7caf4bfb63a4a4d2bbc6b0b3d458c065bef6f103f476aa
font_02_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 10648 bytes
SHA-256: 8e9ea83bd12773ae38573a62711be4b5c2cd16b51c67af650da92cb911401cbd

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