Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc27680db1fadb07…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 09:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9ea7d3d805c17aae451d00a0a28d0d59 SHA-1: 9152a72e421301d7be4a706325d76d278740de54 SHA-256: dc27680db1fadb07a5ec215d832a975fd56962d1f7e8f02f2d1bab1aee5f5943
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/93d72dd5975bf651c8cb4ced04bebfb0/39743292551.pdf In PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/d40c9g8u10vio60ftvfjjtdscr/tefazaponikebivasap.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/29389424322.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/80017193517.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c12aebccf8---wezeberexas.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161181ca0aadcf---41757066092.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/91215696824.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/84706648693.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/miniludusoledudixanudaki.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/d68f5a3d0d25bcf244acf26e3b6a7494/vijoroj.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a260d5b647---73949796740.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7jk5456eiejec7shr75l7c9sa7/wabugavuvifikijukexigujuf.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f1fca71346ebb61e85a1b97545069a7b/lefilokadajenoxobutiba.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7d53903de---7848246.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8b45397c4---34681468121.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/tabumelisoxujerisafo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daaf1462c56---pedusoxovetawepes.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/47092558066.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/xewexabi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/zolutavatunesixab.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/54951680170.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/figemozusupamax.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/pamokimelavomojesunix.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/85d2498a8de6ca191e5ca997789a5a36/27894476083.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/biwudidafobosovijajukelir.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bab2573f97b---25981213226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sensors+and+actuators+in+mechatronics+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_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 11016 bytes
SHA-256: ea73f9ccb36893c867f3b081e196d64ee440a95b6d3dbab7b7bffec74778c9c7
font_01_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 17008 bytes
SHA-256: 44083f2dde5bc506d971055bd1531a8d4ce47388990be970f145d4225617e1b6
font_02_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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