Malicious PDF — malware analysis report

Static analysis result for SHA-256 258668e8158447bb…

MALICIOUS

PDF

85.2 KB Created: 2021-06-29 12:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9b14524b42d34b77c014958af057dc97 SHA-1: 229dd4294e24a3017fd1a28cc946f26efeab521c SHA-256: 258668e8158447bbd5a5d5b810a69512b75fc8560cdd20fcb714002bdf80e07d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the use of disposable hosting for link distribution.

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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ab4e0ce25669884198313405acae4d0d/62903679563.pdf In PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae7606e48a---94516644028.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/835f49dcf0054bc953c44eb75b4c8f7d/19473540629.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/51300925194.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c87c3f6b739---padis.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/fitoxinurivovopokonif.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/94467999470.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/84395fbd5aa0eeef8a2bbf3530c2f188/95598247211.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/83978837178.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d432c934c---15947087064.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4441f34b---66927827091.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c07bc18ee---wetipelewidubikefiziw.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/68936251935.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/newawuxig.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/51156890904.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/rghnf1vrgop3s3d5gortd5gft6/64805561593.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/46665814662.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/dd1661caa55339a2b88b8f48bf262834/4107208057.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/8267062ed09c291ebdc1e17e9c2b05b9/jexutawunedaromevesek.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/65221550553.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/pifugizurotegizizinov.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c65ea8570a---likutifo.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/25994741952.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd882a704e---gejuxotok.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608300400abae---bizekexitifibomagofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=large+nabothian+cyst+in+cervixPDF 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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 16416 bytes
SHA-256: cf75b08d38e525bf7da8ec26d35eff23dbfe18bbba08dc7c9681020ee02dfd9c
font_01_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 10844 bytes
SHA-256: 117bfeb62f6a9455cb2d94057801184a3ba126c4bfe7e1d56e2ed6e979b99f62

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