Malicious PDF — malware analysis report

Static analysis result for SHA-256 8460096d8aed52cd…

MALICIOUS

PDF

99.6 KB Created: 2021-08-20 21:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bb29ba586dc08e526511045dd403bf1 SHA-1: 0189921b4927f6a8c8c482dff8366dccc042592c SHA-256: 8460096d8aed52cd324376b021b8330470353b2c39447391161d97ecd81af6dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://crewmak.ru/uplcv?utm_term=alfred%27s+essentials+of+music+theory+complete PDF link annotation
    • https://wecareu.net/ckfinder/userfiles/files/munorerozidi.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/mewetefezoju.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/btc3a6s16jcv2m8u8eua3bconb/77622749544.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609804c187332---vasixatadojobuxarulodebi.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/wixetafoxoxofu.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/lekiniluli.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/46b5abe5a5f9d3e535544c48d59b0ee1/55958295069.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/79718144077.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fec5123210a36ebf56ac7e187c6c7a42/sijatubimurupiv.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/48041541227.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/sarikepinisozizoxeb.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160736ec17fc7f---gudilabamirol.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/43988474205.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/jifajesitidaruregemurajod.pdfIn PDF document text
    • https://ekransamara.ru/files/37332643053.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610aad66d5868---22860470815.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/gijuv.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/38s1n0tkerk59mbg8jhp8gf23i/11624672692.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/zevilovakus.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dee6317d56e---fitokesuse.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75be97a10a---42838153852.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/rakumaporaxi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a640da66e6e263fea40d3b6d03f2b0a1/divoki.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a444241e730---levukefudebedobiruve.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/o2ahu7lcf4cg9u3of1cpi7ep00/39330955831.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7abd0effaa---bikediwopepirunaxifawidi.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_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001357e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357E 11112 bytes
SHA-256: 484009484bb071d2cd41716f8ac5b694381e8eefa80767dbfca87643a9bb02ae
font_02_sfnt_off00014f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F48 19284 bytes
SHA-256: d12b42abad4951334a5ba40d6520898a9691f4af2c4ace618b05d456361be3be

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