Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e8c6355f2c775b…

MALICIOUS

PDF

73.8 KB Created: 2021-09-03 13:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 36230f0a2e7627d87bb4ba892d9c5d1c SHA-1: a32deb083f06ecf39756cfbf95e9ea860557dde0 SHA-256: f3e8c6355f2c775b3e67a9b14a209db2fb7db23e2c770cbb1140f8842df63906
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on compromised CMS uploads. The embedded URLs, particularly those hosted on 'oneself.pro' and other suspicious domains, suggest an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c7971237d---jenijagibitesul.pdf In PDF document text
    • http://susasoft.com/upload/userfiles/files/95466913214.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/tanulavisanu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/1fb63444b7eba7529d6d39b34db90c24/wolenotolul.pdfIn PDF document text
    • http://wirheiraten.de/images/file/2179940387.pdfIn PDF document text
    • https://argumentua.com/i/file/zijanev.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/91352371467.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/52718705641.pdfIn PDF document text
    • http://seamacros.com/upload/file/18048036820.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/52724255678.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e621eeea4f2---48432958939.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/tamupomutazapizaporeti.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854a91d1d78---salefafiselipevalupenelip.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/91062447570.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/zaxuputasasasu.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/7s53e9urp862tbh9mlj5d9egbb/406472031.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/gubavevoxorunusexedem.pdfIn PDF document text
    • http://slsnn.ru/content/file/gesoforolix.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078bce9f1645---nipavawekizejofatesazer.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/79b1ibscu6c79i42dk129homnc/xarunosurilebij.pdfIn PDF document text
    • http://getem.plfiles/file/fisewupuv.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/mubifomekofu.pdfIn PDF document text
    • http://recviem.ru/img/upload/5088324730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=9th+class+math+book+pdf+in+urduPDF 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_off0000bdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 11156 bytes
SHA-256: 24093ead01478e9e2efbba2589c13fb67edc2c184122ec37318806cad324d930
font_02_sfnt_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 16472 bytes
SHA-256: 16326f0c54f330774b285028c81bf4aa569e3fe50d49662eb5f8e10e3485c3db

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