Malicious PDF — malware analysis report

Static analysis result for SHA-256 70165bb65e59a4b1…

MALICIOUS

PDF

91.9 KB Created: 2021-08-13 11:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75e033beebdf28af6312709e7e65a5ce SHA-1: 9bc7d0ad7f04ded1745aa04031ae2fd61cbff655 SHA-256: 70165bb65e59a4b1ed3a51fddadc805c288189af3bb960cf7b2238496d60012a
96 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, identified as a link farm. The ML classifier strongly indicated maliciousness, and the presence of these links suggests an attempt to redirect users to malicious content or phishing sites. The document's structure and the nature of the URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b12316945e8---nuroxavumanokeselewedufad.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d10b4fa00---51300031931.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98765727f---gajadizawelagurunabami.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/24425904683.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/81300594426.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/zamejekuj.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/wawowizowu.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/eb5db8bf035ecbb8878bba6a4f3feca0/kefapazemikojonexu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3d4e447a---1845583548.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/46993873985.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/61f329ccf8f11c4a3b875bf19802eb5c/57185414964.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/91304968376.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/xilevoja.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/pudolutubawasozozenumuge.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/jajosexawerupaf.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d8842e3f0---rogawosowodezexibunaji.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a59c9e700b---torabofomemezudef.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fd4a5c6048d6e9fd730cdd1067ee4725/rujesabokuvib.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/63183293562.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/73586113435.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8526db6f44---mubowupuxi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7f0ef6be---18655195506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cerfa+cession+vehicule+2019+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_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 18812 bytes
SHA-256: fd56855c6489aa26185e550c9c43a6af9928c0487b2e2eaad056fa688c529f55
font_01_sfnt_off00012e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0C 11280 bytes
SHA-256: 9a7fc0a0151113dac629c9c85621bdf688180c55d4598a149ea04298ac78e413
font_02_sfnt_off0001488a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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