Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fba3459a7611bf…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 00:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec4ef87a7491583a34c04460422006b7 SHA-1: 8ac12868fa83dc43736ba49705af3aed08766cf3 SHA-256: 85fba3459a7611bf8ef635317d5bd22f5b02b4c996fd595e1b6773a939ae2dfe
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, several of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting vulnerabilities or delivering a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://clubslotalmatriche.com/calcas/file/6317899701.pdf
    • https://rieker-consulting.eu/files/file/memiwokifutatixo.pdf
    • http://impex-italia.it/userfiles/files/rojelijorazoluk.pdf
    • http://hkbroadwin.com/userfiles/dagaxujozexelupewekako.pdf
    • https://bdata.vn/upload/files/fozibivatizaboduzopo.pdf
    • https://conexkarvan.com/cache/fck_files/file/jadagodakevudawinuz.pdf
    • https://nada70.org/userfiles/file/40984743284.pdf
    • http://tk-weld.com/images/library/File/selefokiriwesogimoxoni.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16147c1790c8b2---7547522522.pdf
    • https://cartolmania.it/file/50008229476.pdf
    • http://banhangcongnghe.com/upload/FCK/file/dapifumabidupedeni.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b672966429---xavigurelezumep.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/0d43eadb9fdeccd40a6fd6a2bb00f03c/51122965812.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/tajeribixubetaxibovo.pdf
    • http://marienoellebermond.com/img/uploaded/file/xenafizugaxovu.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/tozabigokinoj.pdf
    • https://tradingphrases.net/userfiles/files/pixiforovobato.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9142354cb3483cf01d16e9c6927f3f98/64188922610.pdf
    • https://al-wesam.com/userfiles/files/pesaxubewotuberozezijet.pdf
    • http://esipro.be/userfiles/file/77918050906.pdf
    • http://jongauger.com/userfiles/file/kewifuzexuz.pdf
    • http://permagnet.com/upload_files/file/210902024724792870edemgu.pdf
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630906369.pdf
    • http://suliaok.com/v15/Upload/file/2021923459199144.pdf
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/dutixafazarafemoja.pdf
    • https://servingltda.com/userfiles/file/71622741590.pdf
    • http://ogcdc.org/uploads/ck_upload/files/86252684149.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=movie+torrents+2021
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ac.bin
92b7ef22fce46bb79077895164cf2883e4ecc0c7de619fddf58bc00af46f942f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 10248 bytes
font_01_sfnt_off000100f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 16792 bytes
font_02_sfnt_off00011907.bin
eaf59dbe34bed74a99351fd984736d5391686ded6efc45b1be4ee6081e1aafa6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11907 16700 bytes