Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fdfc42b62f08d9…

MALICIOUS

PDF

79.9 KB Created: 2021-06-25 15:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d4ab2f6d0e5a6f0ec27e7272a93b952a SHA-1: d273965c69e05a3a78275b038224ddea9fd6004a SHA-256: 39fdfc42b62f08d966728e9561c09285d16aafeb4ab37a3dbbaeb898af31503e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. Heuristics indicate the PDF is likely a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The presence of multiple external URIs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://chcial.ru/uplcv?utm_term=word+stacks+level+3551 PDF link annotation
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/27a50287ce787f524f3bfb9d46eda922/35936715929.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/74315474010.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/15563ace961e8542bb6724c753b50113/74062397040.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9001a1d60c7ca6ee38bbd27916da8b0d/fezoros.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/83815657660.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ba23c2f6f45aea37472b35e8ef558c94/80974291570.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9134d4aa---77826063011.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/9390005681.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/botatavadatalafe.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/95497018966.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/zatudefebidugavunapenix.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/87527394773.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hav9kb8iah1kfh5v69nk0p35k3/77753137493.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 16400 bytes
SHA-256: 0739e19cf2d6f524ce970d179bafe095ff4e09de93035e295fd2f8b0051436a2
font_02_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 16968 bytes
SHA-256: d6061ac2ba3b0d5bb4eeddea348cc421714a44ca012f2ea53476a66c517d2cf4
font_03_sfnt_off000119ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EE 10676 bytes
SHA-256: 5fd1c34e7a3203bc6b3be66c2108c18b0c6ee77ae0c8720d03f12c970397fd45

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