Malicious PDF — malware analysis report

Static analysis result for SHA-256 9369054d6f12afed…

MALICIOUS

PDF

155.1 KB Created: 2021-09-02 16:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5cce6363f705e921b682b54edfd63ab7 SHA-1: a27ce448c36ed6c5a1545abb523d8a8498c4be25 SHA-256: 9369054d6f12afed17ea368505cf6f2937fdd9c9b6dc589d51573d40d532b4e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to WordPress upload directories on various domains, suggesting a link farm designed to distribute further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using disposable hosting for these links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609484b9d514c---34313257945.pdf In PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/17347085612.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/604lk7b6m00fn37fl0g8d6eer1/75743958838.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210806224954.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160813acd2476b---bodusemudeledik.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/555f5750f69d5d93439dc08f1a894e3f/tagagenedijujotinabuf.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/kowedozonepuwed.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c804451d4e---povadexilekalitufovase.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/dojaj.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/63616999784.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161107e6921847---57860718229.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609211a460842---wibumilixege.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/1d82b7547c41ea8c2259b9ac3b057119/vuxilo.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/tozudegemixozuxinovoxuwen.pdfIn PDF document text
    • http://mamitobe.ru/files/file/lewegovesisegape.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d1292bcdd545fd783ffa3c606587c04e/59559219993.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608dedab07a8c---tukedinutawajuranurime.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/vivutenezenolikufo.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/sowisure.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210902122601.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/dulalatajamabikutewibore.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0e308f12a---98169085313.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/torakekov.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160831bd4c493e---79252997500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=naic+own+risk+and+solvency+assessment+%28orsa%29+guidance+manualPDF 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_off0001fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCAC 18552 bytes
SHA-256: 9fab8b269896a3280ba9a4606b9153d327183d67d40cdd961178fe5341bb1cb8
font_01_sfnt_off00022c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24424 11304 bytes
SHA-256: 1b1aead4ca0415a01468729b2118deafc29a308231ef27f8cba3f941473d029a

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