Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80b4efb27494d7d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 20:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e145c1fd03e80bedbafab69ddf214361 SHA-1: 62623efdf137b881b44bdbd0b7d5ad9dca1fa35c SHA-256: a80b4efb27494d7d514dc1eb05d3c88d8159cbebcdc0744a288489e3d4920c54
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV heuristic strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The file's structure suggests it's designed to host a link farm, likely to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=human+body+systems+worksheets+for+5th+grade+pdf PDF link annotation
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772e3c0d78c---daxibiveketu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/wuletugovupujilofi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16113e6e05ca03---fuxasufapexi.pdfIn PDF document text
    • https://masihpt1.com/contents//files/xanerax.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eb81eb9b---temowewigadufurejux.pdfIn PDF document text
    • https://aitalk.vn/upload/files/xezar.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/315bd25a82239b2ecd850fc2d789eab8/tateluvuzususub.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/l32n92qcgodbvdm0l1m8ldas94/49825717184.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/d40c9g8u10vio60ftvfjjtdscr/tefazaponikebivasap.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/60368499411.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5mrkg99uga4mth55aqjgfsirm3/fojapurebadexevode.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa44c749f---ritiferedipozujo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160721cba2e53b---vozaxotanimevitiz.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503135359281418.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/toputadavexubiza.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/qi6prm3btgn3i6tgd3j6nkd2ms/30229907856.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/952129791a72ba34ccfdc70030c9ce06/67808011386.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1f6a1213279b9c1daf97e8edc9b6455a/gekikugusipenigogaren.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b9ce7b414a851a69daae39b32547b746/pobiworovurawibuzuv.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/bowunurozixasapigenise.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/tbb59t6dgac3hu2m28114osf68/tonowukivedigaborulemaful.pdfIn PDF document text
    • https://kopari.hu/files/file/15760212980.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085bba7242b3---dovedunitupugawin.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e506975cc---70579812591.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/15586865509.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_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 17928 bytes
SHA-256: 82f2a8c78a36a572a0540737c53c91138d65f50fa6f047b87950253d85e38d34
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 11464 bytes
SHA-256: d257ec7355a0c737ab4718f0ce3cce8fe864181d714aee7be826642bb870eef7
font_02_sfnt_off00012401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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