Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd99ad9ea2f9b16…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 20:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 316b394490132b1d11b357532c1b9e5e SHA-1: ca68d8c9992f47969e6332c6e66415bef4ce9750 SHA-256: 9dd99ad9ea2f9b16d9830f3dad5d1b2645e4666d30489eb930e330cefaf6d309
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

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://webtechnocrats.com/upload/file/nudobifagudinof.pdf In PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7cd95b5cf747440d4bfccb54ca9c59e4/dejozuluraguzaxeguja.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/21911068166.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/xalisurox.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/11148169472.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/melijavowabefenaboda.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/41r679k3q3l6ked84pj44q9gv8/29618531069.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e39c2298516613bf2b811a37beecb90b/nivezirizimaxagajeli.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ec6bc8097101fc29e06e532acf95c159/42787048640.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a769951e9---tedibazavogovoja.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075b52799419---6966898447.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/zejupibulodabobeza.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/9864699728.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/viderajugasepejowad.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfdce7dd6b---desefosekewez.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/44fe343c07a5817755133b516a5c8714/69615103279.pdfIn PDF document text
    • http://101balkon.ru/upload/files/vufegizafuven.pdfIn PDF document text
    • http://linker-apps.com/files/56926481391.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8894487af7---wudobela.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/30712818495.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/ponetedumobeduken.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/96352301342.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/12495348926.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/qvv7kst1a800vr52cijahed8ij/rarageziwat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pre-k+progress+report+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_off0000d060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 10396 bytes
SHA-256: 75f514c35d8df44d06ef5ef21e53f93c6973bab4f67d1a0b6eebf9b2c56fd225
font_02_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 17664 bytes
SHA-256: 7fdaec248f2462fa91565a32fea323ae1bb16b033c959e6302a397aa8bf2a78b

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