Malicious PDF — malware analysis report

Static analysis result for SHA-256 9850464cf9610661…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 18:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37908b76b1a00f34b387f38a6abe9415 SHA-1: 1731bf0da220951a415a799c6603d322bf1fef20 SHA-256: 9850464cf9610661c0e73fe5d39ddb46d9ba472cc19cbc0f22ff4a2d49192ae1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to compromised websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a tactic of using disposable or compromised hosting for malicious links.

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://crysiq.ru/uplcv?utm_term=olympus+xa+repair+manual PDF link annotation
    • http://mcap.cz/images/uploadedimages/file/mirarilumov.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/j968bj6f3arosqjo7q4pl2l3jh/majekekopuvuzegipa.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/kajazenatigu.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/xuxabenubogedumiraji.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/71059833070.pdfIn PDF document text
    • https://led7.ru/file/8528571794.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/50624204232.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/wevewobi.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a7a148eb---42683338034.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/zinemomowatugaje.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b441c9823b7---fibugukejomufetazefigef.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/fukepupobelugakaxalutizuz.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607119bb48ffe---35485692441.pdfIn PDF document text
    • http://scro.ru/pic/file/tulofuwub.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/nodixuxagesekerixile.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/4eb6ff45da8eb8efff88d928e23bb298/jesajoz.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/93623613402.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0237996fd---168850651.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a0911cb0620---xivafojejatusexex.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/20/7817733558.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/806cc6bae63ba5f278b9e71c882b55d9/57210406878.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1daa8657a8---73561568603.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/59973228747.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/zaxevimokorem.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/37701377742.pdfIn PDF document text
    • 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_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 17024 bytes
SHA-256: cebfed6507296cb7e9d8b2fac13f8cecc3dab9c7bfb2c48ec38c88b07621366a
font_02_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 10536 bytes
SHA-256: efb3bb551b2a24196ad4fa60325a5070478b8c140fea460fd47e581755802c93

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