Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c511589e1d587f0…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 20:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 83efcec6352024aa521f61b243b24f68 SHA-1: bc6ac0b2131a1e1fbdc3e802ec0c9f09bc5771f4 SHA-256: 7c511589e1d587f04c7ab8781d534a8fe3aca2df377c3fa41f0a60dd60fb425a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, hosting numerous links to other PDF files on compromised WordPress sites and disposable domains. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://anyimaker.com/upload/users/files/fagaduze.pdf In PDF document text
    • http://geoodwierty.pl/files/file/68587805287.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99933d1f15---67400415263.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wedaxenubawejukuxevojifev.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/risegudorugalidaf.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c57c0ddab031cef858bf6977a987e8e3/vobusatirerekasafosodix.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/65b25515f25940e9f1cbac25a0192d35/pamefeguda.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/vvckbq1it9fsmvu20dk316d7db/lemug.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55683552434.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuditelosubonudojuri.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2rcgs3s13lvkhn265u13mcc6e4/96674641297.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/9420775260.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b768cb22455---vuxov.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/48910912460.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/pukatilo.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f525aa141f---vegazafo.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/54416102700.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/ludemetojemuneloripujili.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8020e19ba---defaxomakijipezolelure.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/fb1be9f93b7282b606a35e70eb0c1c9c/36040316455.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/846e5317a09a1b00f946649bf1f3e5b4/49489206835.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/bolimogudolabuxolavoziden.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bfc147d5e---85698713659.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/79931243439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=miller%27s+ale+house+monday+specialsPDF 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_off0000e9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 10920 bytes
SHA-256: 2ca3464a5fe3fe1c6258a476dac4f3ddb68999ebc19880f7f8af07d91ec26fb1
font_02_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 17296 bytes
SHA-256: 2bdd101afa37f55f4de55e64399807e2371291491fd72c98453384066dd2ba8b