Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d3f1c4da5e0351…

MALICIOUS

PDF

88.6 KB Created: 2021-08-16 05:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8b1e0347c6ec80354e2215650a2b6a23 SHA-1: 94fb37929d31e93218167fbb7f69df7d6f9a8889 SHA-256: 90d3f1c4da5e03514e7138a8710cf99c138707147a45d168dbf016c8252b11da
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains associated with link farms or compromised CMS uploads, indicating a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://synphabase.ch/upload/file/legovagokuzof.pdf In PDF document text
    • https://behagi.eus/files/galeria/files/64391838115.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd93eb16a---1161297094.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/desaxemetomukipokinone.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/rerukewelo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4f120dacfa54d34373605347f520fce0/weredukudukefofi.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/67396793152.pdfIn PDF document text
    • http://norservis.cz/files/files/kotekuv.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073be764bb04---32598707404.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16091e18a82b62---dulapadiwuverudiwipeb.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/87100321186.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/wuvelewozaxafuxaxi.pdfIn PDF document text
    • https://hsse.cl/files/78445021543.pdfIn PDF document text
    • https://huaku3c.tw/uploads//files/202108121004124911.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1401f4b7bcda8b4715d2cf525931ee6e/rupigavabodufupazofado.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c8d93acd226767f30c2cf1e30f1e29ca/xefebutimodotega.pdfIn PDF document text
    • https://lecapsuledigian.it/file/53343482296.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9of4h4uhrd4dp1u5071vadecvl/fuwujigazejitijarujowa.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/govosuzumofesibopapuxin.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/e5a5a75ac5c42c4b96cfbdde6b46e211/polerixusuxigimevorobe.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/lukavo.pdfIn PDF document text
    • https://artenika.pl/fck/file/tabijubi.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/25488210534.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/82759847559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=exercice+physique+chimie+seconde+masse+volumiquePDF 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_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 11192 bytes
SHA-256: 81357df3a3ba4a44149073da72304f82629cba29e307ec016bcc206d3ec96579
font_02_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 20004 bytes
SHA-256: 5a7734004c19c8d3bd45e07c5ae56b263285abe1a36dd0b07dd07854b39e879a

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