Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f7064eb8b0afb3…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 07:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb8e92d97b30b441b4e3be08fff96331 SHA-1: 24b0a512da8557cace651584af77bde0a3ebfb14 SHA-256: 84f7064eb8b0afb30bfddafcf60a51a0f51d0409c508264285f36ee820d0f07b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and embedded URLs suggest the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://lyzjkgm.com/d/files/67867589104.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a928b491466---nizufumijudalumamoseket.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3m11vbop8rfbj47qqapkj29u11/93348216329.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/58695109078.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/fixuvularadafiraxonaxuv.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/r9hcme70evjfit3dru89e5flp1/26081563562.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/lerisumebozewapokufe.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/petenitik.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/85727890298.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/vapetusepekerifopuned.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/gagof.pdfIn PDF document text
    • https://clinicscrm.com/img/files/7678859309.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/zevulifodu.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/ruvozitolagexuditosonuno.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/srgc3n3q1e4fh6l9bov3dhp8qb/3300847082.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/82093031705.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/31411832963.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/pemawebevomenikudaz.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/nikizixofoxezesatuf.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16077f16f4ac69---3933765580.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/73361763064.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/83772624891.pdfIn PDF document text
    • https://bloomeng.com/uploads/lelemataf.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/69463142062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=anna+kari%C3%AAnina+pdf+em+portugu%C3%AAsPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/66897761226.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_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 11128 bytes
SHA-256: e44a6422ba203dc9b5f394261d387ed244f756ed3cf08a6fae8a7d9753d3f181
font_01_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 20572 bytes
SHA-256: 4aa56d0e86d6ca63ad051c2494f3da5f8f165cca683bb05ed2009f410cd33425
font_02_sfnt_off00012781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1