Malicious PDF — malware analysis report

Static analysis result for SHA-256 420dfb5bc47b2f09…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 04:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7255b2e77938f8a1f2af73e298bf2e14 SHA-1: e8626f390f19f512131dd39a3188d424501ea9fb SHA-256: 420dfb5bc47b2f09e5107ff1761c44711c5ff50225a43ba770ad2c5012765752
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

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 http://aviteksural.ru/admin/ckfinder/userfiles/files/gupuzewubekomofoniwo.pdf In PDF document text
    • http://phonphangschool.com/upload/files/68998632645.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/14813691542.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/gasaxowoduwadafik.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f851ece4---65519600505.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf7517ce05---72133452861.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7df152ad---84568446831.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942d8ca75a8---dujupafizepuwexesalow.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c369f8b62d81d9739304e2e4c3c9f361/wofozesorawamibabizoseviw.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/66944881481.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dcc18a6e0---fukonetigogisizetotuti.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f2c1b29d---53259391069.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210805044219.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/nidexanilasadavetu.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/34508971410.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a006e68f68c---patigefuwimibezanezaxusu.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/wawubedisozipawonodutobep.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c54kpoopt9uj33eiji0kc27e5/nuximufipesogorosixa.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/xesifadoduwajupufipamuwuk.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/gekanu.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/1109841450.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/62a0cf8e5e47f5103aa63313636206b0/23031031970.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/33992807118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=furac%C3%A3o+anitta+pdfPDF 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_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 19252 bytes
SHA-256: cb69c2a0c051e99ca80e1ce99fcee5a4f858fa19cccb4ccdc24b97bdf472c419
font_02_sfnt_off00012559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 10608 bytes
SHA-256: e75233581c9281569d1e924abc2b2b67b8053ae4ccfdcfa7b6470c6b38e1a302

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