Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1396d8d9d26d7c6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 17:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 713e15a56791e9a97614ca795e02d55b SHA-1: 98dedf475c5d866f9ef125d871266035c1dd2b34 SHA-256: d1396d8d9d26d7c651174571b9f027965673cfeb94a6fa3722f2024d265f8f55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting domains, likely intended to lure users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/feb73a186433463990c6d412a176cc52/66363099789.pdf In PDF document text
    • http://www.contectrade.hu/fckfiles/file/58988233162.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9084ff08493625c56b0cc3f7479bfcf0/kumopezajiwagesojemonejam.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/lozawasamiwun.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/67151823420.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/30041754017.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/18607355120.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210709_C35B7A9A5DAAA63F.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210720_411413202EABCBFB.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/35879376848.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090215065613.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/71507300598.pdfIn PDF document text
    • https://lasanisports.com/files/nadudubu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/36ae071fa9d0e53b72339ba6c4417431/53838764939.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xuzevolefivawodabutokoraj.pdfIn PDF document text
    • http://lucann.com/Upload/file/buges.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/43678454991.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/zisiw.pdfIn PDF document text
    • https://activepymes.com/pub/file/nusovajijixogidefugupe.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/io17sh5a2odh5gu2b5ircjs6v0/39994446991.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/xofiva.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b1e3a162---norasurerojilotafimi.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/37415437597.pdfIn PDF document text
    • http://herve-coiffure.ci/files/98886601250.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/76r0eo3teeporkp4veji7viq1n/57010087453.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0e949e8e8---nexuxekudepukisokinexu.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/givikebori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=telescope+history+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_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 10528 bytes
SHA-256: eba03504444a5a70d241b6d8aa0b53e1a8a8a87cc5994c43b2787e4f48019e6b
font_02_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 16184 bytes
SHA-256: d5eb9264248850b0d43481a12da021ad9c6907f9c8d3a318a03b67b2d5bc9165

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