Malicious PDF — malware analysis report

Static analysis result for SHA-256 3771704bc704d28f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 16:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9932600fecc0342181cfd6c8ede6e9d SHA-1: 2799d551f21e73d8b470befbbb865cfc6d66f70b SHA-256: 3771704bc704d28fba940eeb22e366c05c612689f9eb93321e4ff33a17830337
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ristovski.mk/public_html/upload/userfiles/file/42486005181.pdf In PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e070ec9d91e7bb1a0324a2f417bf8584/28137407468.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/55805604686.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/48396037614.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/kodirebodolurab.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/97199940582.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b5874aa29606d5501fd3801742e8b9d4/93440242136.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/boravabunegerurugerepix.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/zejejipitexatifopuwifozip.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/jibafinixa.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/31811554375.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/nagolikurijokovugagol.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf0e2ca6d---tamutifepovovolugos.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/409fe1f2008d8a4147cd16ad0ced1bf2/rojixekaparubedaw.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/28242211662.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/99494085164.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/peruk.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad39a6a410---92272879796.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/gugupijutuzejizusojib.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7a339f1a6---87386800011.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a41c2bbbe---88900085958.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/18984202410.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde8eb2533---7239547845.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1854769566---dezoriwopiridekew.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ajevi0vupruf2bjloe2ah8h3at/93583048624.pdfIn PDF document text
    • http://dakmet.pl/upload/52299965865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=linux+concatenate+images+to+pdfPDF 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_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 20428 bytes
SHA-256: a06d7af8eaf93421e38b37e62ee4d2904bb299f5f0b1911a50843a9bcaf18e23
font_01_sfnt_off00011779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 10976 bytes
SHA-256: dfef66dd71589877851a729dee12d48545122e1b22e30c64f67bf0c7f5c43c28
font_02_sfnt_off000130c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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