Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e562eb72b249a8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 14:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f9c53c249435475ab12a9477b0eb241 SHA-1: 829b296f67152570a52db90523265c4ec4a1303e SHA-256: f9e562eb72b249a86ddcb0ffd9a42d603ae41dd80346f59f714292e7f4620868
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. Heuristics and ML classifiers strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The primary attack pattern involves luring users to external sites through a collection of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f39f40839245e31558555f47a0cadfe4/nuvaziditologapigasevaga.pdf In PDF document text
    • http://dade666.com/userfiles/202109file/2021091417223870554.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/19851758585.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c1f913df---48518714181.pdfIn PDF document text
    • http://tochuchoinghi.org/files/89023849345.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/sadovavapemojesegijari.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6c48d32b---benuwis.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4e0199145dfee94148dd80e18e089eb6/reteninuwuzo.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/10708531470.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/76339221531.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/97824109286.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/54079857610.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xaripalapalogixeto.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/76242193042.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ae107a62f---fixosu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16145ba13559f2---sisuwipetuwisinologij.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/15215762516.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/faxanusinuzul.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614beba55eb78---nufuvil.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/fudaj.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090912252447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=let+her+go+filmPDF 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_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 18180 bytes
SHA-256: d058e73c1b4ab1421cf7c1455700159fe5afcb0a8f1ac301e8e34723570cacdd
font_01_sfnt_off000107fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 10184 bytes
SHA-256: 78f0f2417d89b774ef59f899bfe42a8d5923f34d82dbc1cfa98358f996ca3f2e
font_02_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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