Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f684c6577a2930…

MALICIOUS

PDF

75.2 KB Created: 2021-09-29 08:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: eabc3ff11f98d8c3cf189eb44851581e SHA-1: eb6336f316fb39afc41cbfd176f01556c5b3736c SHA-256: 14f684c6577a29306f8aed61019ea023fc175bb525671e67f97b1dd99d936e1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=windows+10+image+backup PDF link annotation
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a0637077---37234028098.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210920_F6112E1A6BF564E0.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/32865721934.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a1127bb6dd1ea95051e80713a61c85ff/duwixufuzakufadavame.pdfIn PDF document text
    • https://sambelteri.com/contents/files/tabatekizo.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/xalegatomaboz.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/97a1lacadh6alkec9ao8of29ar/sasalinapefiwatotiwojeb.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/61707056872.pdfIn PDF document text
    • https://parc-hotel.info/file/kiwasuviwanokunusat.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161443b90eb121---58351172683.pdfIn PDF document text
    • http://www.bash.cl/media/file/jinorapepotopodalifajal.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/772d858f122cecc2d4f59c282bb1312e/mifaxabimowimomewu.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/82189535211.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/93772590233.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388c13e2039---16550440373.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/tudalanarapuga.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/xawepajesijenur.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/lajowupetejovitejukoru.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/dofap.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d5ce1666c32bd881db32e85d2d94695c/36602401266.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/17206045522.pdfIn PDF document text
    • https://cartolmania.it/file/22878384186.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/30035864569.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/gasinifudiritadi.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/dagapibiwezakupo.pdfIn PDF document text
    • 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_off0000b9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FB 20188 bytes
SHA-256: 23b2822daa3f3c8b2053ce9dc90f8f07f33b401a81a2364003b418aae47053a8
font_01_sfnt_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 11200 bytes
SHA-256: 0464962c70b9ae486406eba2becedc1cf2f04a201586913e480d5d8d6017850d
font_02_sfnt_off000106f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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