Malicious PDF — malware analysis report

Static analysis result for SHA-256 8146cbbebeebc3b3…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 09:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bdadfa9c86c4f4c1a4d6a6a5290cc16e SHA-1: 226cf5db5b7b92866afbffff537fdbacb739c196 SHA-256: 8146cbbebeebc3b35778377d3581d8bb02189f3cca2f6c46c8e42634bc6c50a2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many of which point to compromised websites or are structured as link farms, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URI links and compromised CMS upload links indicates a pattern of distributing malicious content or facilitating further compromise.

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://archism.ru/uplcv?utm_term=vidmate+downloading+file PDF link annotation
    • https://turdv.ru/SITE/files/editor/file/gugigo.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210914_101407.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/pivuvimu.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/diruzodotaripexe.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/90917945940.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/35354333438.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea82e156a---87493600158.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/rosopoxomaga.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/24044116395.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161317d8962f73---zexakarevaxusuroxaxet.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/vaxilugafakifotaxoligalir.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/samorazilufozidurog.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/werujadadomakosukagefupen.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/1721761931.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613874d3384fc---20929355913.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/xurilewepix.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/3951437394.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/suponu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614931ed656d8---24873561865.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/sititevan.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///zoxosojamuwidagamolife.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/mamekaji.pdfIn PDF document text
    • http://ipceurope.be/assets/file/posoweboben.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/vikovedujesorowuloj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB434 15452 bytes
SHA-256: 2afccbfa34b2b8cd2c1dfced750888ec2e1cce590960defc7a35c3766cdc3440
font_01_sfnt_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 10484 bytes
SHA-256: 5da44f21e3361becf7d9e0803de9ad6a1a274f0ea707f6a605da71b6701689ad

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