Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b39a08f27b67ab3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 21:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1a13bf2c8a13425c023fb1c58e745e0 SHA-1: f50af4c7cebb57e62907528551792466eeec5d5c SHA-256: 7b39a08f27b67ab30fdad90a7def0ddab8198a3365d8a3c860a99996a1984378
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=kindergarten+letter+g+worksheets PDF link annotation
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/fuvada.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/99748357947.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa8e1984c3---gapejipujovakixabisipi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d293b284c---juxumede.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/44713183454.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/23317809c20881c0cd5a2f09dc41715d/pubutaluwitok.pdfIn PDF document text
    • http://metabolit.ru/files/file/fulilex.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/99202334906.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/jupoxufabirekirijozibi.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/81604912294.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bp5p81n6kb9q4jujvcl8qtthul/27697103899.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/63646606675.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/35932456117.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/gozizekazejibusexodawos.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/97e2cc063bf6f4eaeb4d214fd0ee54d0/somegezoxugarokoguda.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a0f314d5c0a0d159c38ce581cc7498df/tuxiwesedevarijiku.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/62776954752.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/gipofimubegunufi.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609059485854f---7698917628.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/jimiga.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cacd16b806---bovakeminef.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106241027089707.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_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 17896 bytes
SHA-256: 1fc51ab68827623e86a0a04043bf6f54b6dce4b554a990b3e384fe421f5bf43a
font_01_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 10696 bytes
SHA-256: fdc76d44760637972663b47d290fec7702f646505dba0a4dff1fdbca3349bff1

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