Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffd30370850e2a9…

MALICIOUS

PDF

93.4 KB Created: 2021-08-08 11:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 17b878e01d2b29ec6b0603eafb9cc1f9 SHA-1: 93f319405b28ad8a5a9a6d3f631d76c7aa4f6b5d SHA-256: bffd30370850e2a9dea5e13fb9e3eeb0840d84e8a3937b99b5c3b23a1cc9f685
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users into phishing scams or malware downloads. No scripts were extracted, but the presence of external URIs and link farm characteristics strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=alguien+tiene+que+ceder+pelicula+completa+en+espa%C3%B1ol+latino+on+line+gratis PDF link annotation
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe9069b79---25830577647.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160e815a50b785---26625276035.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/melubabibepe.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a38505bf541b080b957a762e0e98c089/55665301196.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/kidagumukazerugedado.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9ec502d88e5ed1c9d004700db7ed2f04/31634277888.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/77108445559.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93d32ab351---15571116986.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/8752676730.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/63588040867.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/6a695b1ecfe8c37a7070161487cc6c02/kogobexexaworowime.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/35385492483.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/4716418796.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e734ad034fb73a085a922f0fff7190be/19979536062.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb10cc8ef1---loketewofafekalad.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/19467506304.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3f248200---89519499887.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/14324934489.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/zurelonejefanoxakasolat.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/069bc82b3b8e4786f7cdc40a9cb661e7/13918964769.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/58712856331.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 22992 bytes
SHA-256: 95149456064d07b17f1d563514c8404ec9eb17af2eac70446f5750a8c4bb6a1c
font_01_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCE 11292 bytes
SHA-256: f8749ee978341a01af606199b0b1ea68d0cbb162a8b805cc27cfdeb1b8c1563d
font_03_sfnt_off00015787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15787 2768 bytes
SHA-256: ebbf9e201f1705dd58c89a79e8f84b8f05f8b12d5c8c47750de861e392db4fe0

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