Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b602c0ecad9d457…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 10:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 687d5a50c35c7e7983c866c96f398847 SHA-1: 27400f40354f0a03a3b98620536982a08af3eda5 SHA-256: 7b602c0ecad9d4578a8c1140ef90afdc019384218174c79efc72eb384b0bbdb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://irlanc.ru/uplcv?utm_term=nauseous+for+a+week PDF link annotation
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/23d94a1e0ad72319521991f66863a05c/49206651893.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1iencujqotqrhih5oato4to33j/49356565852.pdfIn PDF document text
    • http://sam-global.info/files/file/38533295947.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/jisisilipuvefut.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c31d6a6f---72681504966.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/visas.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/3428087843.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/45034788978.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddc0110ede---12974664531.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747befc7643---gipuw.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/357273239.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3d3c999e5cdb28f215a9ed0d14685d0f/98167564533.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///20934766306.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/483346442e15e2daad3bcaca814db4aa/32211989480.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2l6h2lqspfjphjqcgb63gqlias/rimufum.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/ranedupirevafovux.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160846a4a41eea---15270771444.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d06cee515a2---12135842088.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/57c182e0f5cf73dc49da4c9283ab876c/22259860675.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/pudozasawaton.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cdb8ea0d168d5c907a0827dded3153f4/5247656076.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed03470e0d---fufisafurowamojavonev.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/xifipuk.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/mexuk.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/2eb143f0e231d8eb95c551da740ce7a9/59440361207.pdfIn PDF document text
    • https://ancoraeducacion.com/images/43379203163.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_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 16868 bytes
SHA-256: 8d20300dc40674e9751e47f6088a10dc6ad9136186f63c1c631daba2fa45d75d
font_02_sfnt_off000139b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 10124 bytes
SHA-256: 3ac2291812872981330013aa2174d8bfa0e2986c5fc826fea43fad227c528f4e