Malicious PDF — malware analysis report

Static analysis result for SHA-256 864bf7153272f46b…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 09:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3174a8ee423538cf65ce534a3fdec2fa SHA-1: bdf8b6883d6c414019e6f941784ebf4f621423a6 SHA-256: 864bf7153272f46b08e1fc71346144baf15456b1aa1e83025c721cbbf1776e4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ld9vlv1iokl0knv9s3b85l62g1/liwagubiwok.pdf In PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2cltfhn65j13dtsbmidn5ei5en/79407679762.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/dewageme.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/65103ef3adb8d7fe71f13d57637b3bec/90342789846.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/jajubobovewifutipapifise.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b05cb092b1---90703503069.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/fd5b9af946a17997409728198b705897/lomewuvemawubuzosuve.pdfIn PDF document text
    • https://nadamasristorante.it/file/xininitinidegi.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608275dde76ee---genupomeveta.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a68f78e5e9b---lovolulujuw.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d3ab4632---52563719214.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/pitasevikeronu.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/folasarolupidunivas.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160744d4b76ac2---39169550416.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a1224699ad6ac227069f928415fa56d8/10538276313.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92013403622.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/zedigepibuko.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/csnldmov63gkdoj714odvvq916/3360832618.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/946bff3ac648c0ee63af04ad9ed2e336/11735912706.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beef737d76b---54844488135.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160965985ea8c9---36711059430.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/fcffd99939993e640e203b1e912f5693/gigufoz.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/51110861614.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/6381285109.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/51bd4268f46e9eccfda51abb02fa9ef3/gatawulomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+polygon+in+computer+graphicsPDF 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_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 11104 bytes
SHA-256: b806acd96501c3deb0f422ddac6cf6bfe54a3a043bf4c2d839136c9b67929077
font_01_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 17240 bytes
SHA-256: 32bc73adbe7d60d7a406141cdde7be7bc121fa08064d593b939a756a4ea00a9e
font_02_sfnt_off000135e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1