Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb2809263f0812b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 06:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc3831ea9ea44ccf65afb083a3c98c2a SHA-1: f99ab75e27d49c57bbfb53112a56f3634f656299 SHA-256: 9eb2809263f0812b92a5b967f24bfe2a4ca0a3347b9e243c920ccfc29e35f5af
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Heuristics indicate it functions as a link farm and a lure for invoices or payments, suggesting a phishing or social engineering attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://francemonde.news/UserFiles/file/tarigota.pdf In PDF document text
    • http://to-kajihan.net/js/upload/files/93232515493.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/62453499306.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/42634184048.pdfIn PDF document text
    • https://sealskinz.ru/files/file/jesuporanijimama.pdfIn PDF document text
    • https://allianztc.ro/files/file/wukufima.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021986446981.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/diladevozafuna.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/wudobikuxokewuwezabe.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161386d191d32d---65739419630.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/79920318477.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ba79156f92a39bcf24f49e15336ba4db/56912238657.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/sefub.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/35080482628.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/zufawexe.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/75149080040.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/iq11jomfv2b36pgqukni1n35r1/lopasatusumikokif.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/porubirejezuvogorowinov.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/54593112865.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161306c82100db---jegiraxotekel.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/pusirenupagotomagi.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/dazipebaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=itunes+discount+codesPDF 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_off0000c695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC695 10108 bytes
SHA-256: ae86e429e62cff6ed25e82d00e12c8685db714825511cd1ac9464bc2ecc0658c
font_01_sfnt_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 18848 bytes
SHA-256: 2e95b38b889ba9b4bfc066b54a5d8b7a887dc0f04540fb7791efe56ffa88cadd

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