Malicious PDF — malware analysis report

Static analysis result for SHA-256 008c2f609eec5bc8…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 17:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99edcbc965eb4598ccfecfc09e129acc SHA-1: c99d535a0aa2aecc350a496e2c5685144e436aa8 SHA-256: 008c2f609eec5bc87b951d476e76dd8f123bbe944e5f14366a66ae63f9e8e7ad
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, pointing to numerous external URLs, some hosted on compromised CMS uploads. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to potentially harmful sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://varbackaforskola.se/ckfinder/userfiles/files/8458162394.pdf In PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073365849d79---43224870071.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/71631508481.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/dobifemewinemiteluremip.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/salekariverifosefobumid.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/toxuvavutugefesikemasarur.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac76d428d81---xetumigarekaguleponemo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cccd5d6c5---puxuve.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff7735506---kulufubivizurupekep.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/pezinasezegi.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/76426999676.pdfIn PDF document text
    • https://mavibusiness.it/file/87341234711.pdfIn PDF document text
    • http://naviway.su/upload/files/2953542358.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d07f0bba8---6177669149.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/getomer.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/vokalupitatavigutimisine.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/noo17st1sjopss30nv6urem7lb/53066292830.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/30730183450.pdfIn PDF document text
    • http://progetec.org/userfiles/files/gofaposiluna.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/79341326531.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/uie0c47dv78u93fon5ffa4j77j/pitowig.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/567ae55d183800a7c2425799903f9b3a/dijunusijilogor.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072502543773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hp+laserjet+pro+400+mfp+m425dn+repair+manualPDF 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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 17804 bytes
SHA-256: f0f7213ca833fcdc7f4dc0986273408da0c9516169e4d2ed53b802f4fa4877d5
font_02_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 11336 bytes
SHA-256: 74442cd8ae81caf1de1e4077aced0808d5641ba6b1e97b3e7a2963fd538b8793