Malicious PDF — malware analysis report

Static analysis result for SHA-256 489b5c8b1e0537f7…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 18:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 624c2295c354115606870b570d0fb9a8 SHA-1: aae402c7f716886ef060e521b4956fa79668919e SHA-256: 489b5c8b1e0537f79237913b2b5cdb7dc60bc51fc6cd0859d95f0267b93df49d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for file hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination and potentially engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141136592b28---15635735897.pdf In PDF document text
    • http://weiddy.com/uploads/files/202109152247238775.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/77428184419.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/44744418875.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/besesobedemametasofi.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/31045742040.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449dee24c27---tubozeremulatekitapoxura.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/qjt1cg47brfji98n91t1ehvgiv/fejififuwumidanaboposajom.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/41145566644.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/ridelokuxixol.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/jofomagekadefajinadowe.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/sovojemeves.pdfIn PDF document text
    • http://btfa.tw/upload/files/welunetifekude.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/17624690074.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/78184693093.pdfIn PDF document text
    • https://medius.sk/userfiles/file/50138410510.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/jlgrvvr3u98dus83pdpfe64sre/rinete.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/14011108978.pdfIn PDF document text
    • http://dsraxys.com/uploads/94969030064.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1jrctaisn83rmhu0noi5lq1prv/gebetizoleroguv.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • https://polaria.cz/images/file/tumarebemopukiv.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613658a660752---25706340597.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/pagezemozewuxuwe.pdfIn PDF document text
    • http://bronia.org/userfiles/file/88168798193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fifa+20+file+obb+downloadPDF 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_off0000c8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 10424 bytes
SHA-256: 9bd449920cd808561ba644ac10b92b36d648f1e2561b855b71289671c2363b73
font_01_sfnt_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 17376 bytes
SHA-256: 9ef52db40e30f402cc314b160358b952b32a8f0b2bd66b55d87bad440f218b61
font_02_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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