Malicious PDF — malware analysis report

Static analysis result for SHA-256 855acbdc1c44a756…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 12:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9368bf7fc878b01fe76d0fafce9f0cb SHA-1: 87fcceec791ec8637a97567146616fe6a358b5bb SHA-256: 855acbdc1c44a7563de6c0cd262fcb39ebb42498e7fe3dc781f128916136ae0d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://abimobiliare.pl/pliki/File/vekodakokixobefewapumewu.pdf In PDF document text
    • http://nitecoreromania.ro/files/file/9584844263.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gepizejasole.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/58342276833.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/7390723275.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/2965503027.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131f50f01145---wixudevumajukozazibeponi.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/giwudut.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1v45phs0q9t28lr816qs9hpfer/japumebimobudosupep.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/897a6d9bcadca1bf76b62d5daa75f130/xazupozerufajifadoj.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/11431875311.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/kikofisimudepexekoxukira.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161330e90decf4---kenovosigumamulisatifabuk.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/sepetiz.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/20463645893.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/xufevitupaluwexibig.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/jerovepaf.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/maxujetuxelodemapugi.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/48235205718.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161321ccdd8e6d---watavux.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/xuxupijumuzomil.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/de3f33faf8b2bb73ec7b829ab60b8b3d/52326971992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=super+hot+game+online+unblockedPDF 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_off0000bb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4D 11200 bytes
SHA-256: 71a2d1de7248809007126b58be3776b1a46e3ed76d26f40020ba0ba4a109bd64
font_01_sfnt_off0000d4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 16596 bytes
SHA-256: eec89c70f985b07bce1ceb051bb89c2987b05e01fe98b34518e1bda28fdaf4de

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