Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d1e3beaa6c93fe…

MALICIOUS

PDF

79.5 KB Created: 2021-07-31 03:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c898057c93d72dcd9879a857e2c6c6b1 SHA-1: 8b72c55337e68b6d40bf6f6e2d7a402df725c3d4 SHA-256: 61d1e3beaa6c93fee3eddb8cd0d6369c9db80d6db4ab295ad651342c6d9d4ca2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d9e9df3b2---24170671951.pdf In PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ebf31a6adac4c830027f565a79e575c4/45851913637.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/punelovabosuxufulatiguzum.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/16741114392.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1ea1be1a6be2d5350f4479ff2a67e0d1/melapedifes.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b18a73b1fd0---87659672770.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/rejufesagonatoxojikawiwe.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be02e8ac731---21507520736.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/bb9f33e2fbcc6200efc3869cccdb58d4/vifipopuwaxupof.pdfIn PDF document text
    • https://dineflon.com//files/5037223632.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zorususuzugigonu.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/juxumutifubilugok.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609974b799092---janabizavowum.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/82017706416.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/vojerixazawogiwa.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/48620409584.pdfIn PDF document text
    • http://dzbnf.com/upload/file///mirazawojinorilevu.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/sixuwefudekejejogemi.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/65631330455.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/v9n9cvsiltdbk21ju3lnvasq04/soxejisov.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/futejudedokanapowaviwa.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ea27a87e8---96244045166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=adding+and+subtracting+polynomials+puzzle+worksheet+answersPDF 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_off0000cd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD48 11536 bytes
SHA-256: fc452f5ed026cfd535dade1b308f94c7d04ee3ebcb164bfcaa06f89b10162aa6
font_01_sfnt_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 18612 bytes
SHA-256: 8e4cdf10868b5d094bf41a8b26be0bc0eb0adeef6fbe21809cea02341f913924
font_02_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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