Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfe7539d169e541…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 22:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 201dca6752dca85d558fdf89d0d3f4ce SHA-1: 4177daccfd9b102fae4e6f2ccafb780f023e9c8f SHA-256: 0dfe7539d169e54120c9442c835d11674f4e0bb948c4433f0ea179d843ca53d0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://bruceleevideos.org/images/file/20403230614.pdf In PDF document text
    • https://bravo-hk.com/userfiles/file/kotironagu.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8fe7526a---tipisonitupatenabato.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/27749582500.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c96a3137c0d---64029446187.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106071644340512.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/79693300219.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/vikadidemijanajoxozo.pdfIn PDF document text
    • http://yulintimber.cn/d/files/zufumonadovixonigonur.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb2debfd9---jivexageru.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/32984899975.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/53227222936.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/02264cfa5c96e40e877b1f761a5d7e91/zuvelafiguxiwedovu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb33fda74fa---27768701045.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129dcaaab540---surobo.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/27793099068.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d006bdad9870405fceb9873c3037e647/jomanule.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ddd700469---21560375163.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/52613985671.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/18053979850.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/2313761557.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893fec94448---38190919481.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3f1e3dea0---lijojapesarosiw.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e2629d65b---wawetunepulixigiwixovido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=natural+a+minor+scalePDF 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_off0000cf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 10468 bytes
SHA-256: f3e827b4a02cd39e771b20204bddb84ae59a4440ee69befae2e8803d1fd14e43
font_01_sfnt_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 18132 bytes
SHA-256: 8dda99ba24d32f2db9b96bae6f621e251f5457679af9ba9c570a0b59efcc3e2a
font_02_sfnt_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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