Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abb424082579ba8…

MALICIOUS

PDF

80.8 KB Created: 2021-06-27 16:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 47251cfbb5724c40f8a49b8306c7f64a SHA-1: 0f17269462ba8d293feb19f6b7e483a0204b9a3e SHA-256: 7abb424082579ba8b87529c08a87d9a69b9817bad63f47aed08d5e7e386b1863
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier output of 0.994885 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://wastran.ru/uplcv?utm_term=our+lady%27s+hospice+harold%27s+cross PDF link annotation
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/14d35eba69f7994b3d4d515a3eec7cc9/zofivikuxudovusonekidek.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f648cb7da5---1490491149.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8ea01ecf1---97709320272.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/80449494098.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/027260df7e4a3f656330cd06d04ef08f/malimijikozeginavedem.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/78d55c303b63f70445d846dab10236f2/45749380108.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf7f6dde9---giruvabutededuxuva.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077ebd3aa127---89820857894.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608816a7d0591---lasefimomisubopad.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/19326371800.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/26461753599.pdfIn PDF document text
    • http://rld-carbon.ru/file/xepimiwotefele.pdfIn PDF document text
    • http://temple.mo/userfiles/file/minoluxelodaror.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/lagim.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/bogalidumaxawulevoxinomiv.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fa0121ee55e5b2f7b58259de19b6884b/86869753988.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/rm7ogha3bq578bgitmhg89g99h/55821163139.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4977d331c70bf90b990524533e3422bf/kagekuni.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3c11f50a---60331173583.pdfIn PDF document text
    • https://defaico.com/d/files/zavagupadetosezuzoxiki.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47b2d3ecd---daterevegudegolad.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/biterogerilozebub.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca3d6c8cf---59448896130.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/dejomaniporexejesaradedof.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/namebirunabuduz.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_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 17632 bytes
SHA-256: 2bb1392beb31a3ac7adf0208257f7f53ab5aad2bf1d36945d30435667eee464c
font_02_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 10680 bytes
SHA-256: 24aeb8bdfffb795555a73380ea1db23cb8bb18bb9704203b7a76994097cf730d