Malicious PDF — malware analysis report

Static analysis result for SHA-256 e972c6bfe9dd83f9…

MALICIOUS

PDF

82.6 KB Created: 2021-07-08 04:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aa51042964ffc0b08ba784ae371cba65 SHA-1: d4a995047ac56fbf3ee7322491f1d5edc8a91082 SHA-256: e972c6bfe9dd83f9e5c0cdefdf606626ca5bdcb56ffba8532826e35b22a93a45
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or lead to phishing pages. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/33588b4c438e46d7f21f28f6d349300d/43232767606.pdf In PDF document text
    • https://mimpishio1bet.net/contents//files/38845606069.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/82566223110.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/32533371973.pdfIn PDF document text
    • http://strandedtattoo.net/file/18093269769.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/f0ac974a6556dbffb9ac2a6fdf5bfb65/87178123351.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/79233042312.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/86aa82e977a14abd1227de30298dfcc1/41442186184.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e1304980---mepifapebevaxelapaxewiwi.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a89a69e80c2c115d18bc92f1cb268ed0/kixuwati.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e884a5e50a---38730404037.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/9e08b713b5f495ad66e0f0e5796dd6b0/80690288810.pdfIn PDF document text
    • http://wenxuezj.com/images/File/56403214656.pdfIn PDF document text
    • https://mmszke.hu/files/file/gurakega.pdfIn PDF document text
    • https://tangente-mag.com/img/file/16543125071.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215132158284312.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/sowezuzovazifelog.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47127680443.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/dujuriw.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/xulajim.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/24697972744.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d47508d470d8a3eaef543cea394097d4/48716211620.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/429g5d57cdph410bao5rqiek0n/56160640722.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba87a8ba40---pejevagosomaguliveg.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/efc55a12fd89f21a4f8ada7c30adfca7/fotidilafipasikerewobiti.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/bisawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=banana+glycemic+indexPDF 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_off0000dfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 10496 bytes
SHA-256: 33f2ff723159224bacade8c5b01e7e3ee08e835cb4a965af116bb8a8f6de4246
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 16840 bytes
SHA-256: f5d5aa69c287eb0a6a248e6f21e9ad6cbded481c8d2b7029e8b55fb3bfe09230
font_02_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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