Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd3d27c52b38b64…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 11:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87f0f86f17422d3a0caca4fd5c176ca8 SHA-1: f01344a024f48bee358caefe11333992833935f3 SHA-256: 8fd3d27c52b38b64ff84170c28843ac20016b8e81618f93fec97ee1adbfbc083
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://polaryachtmanufactory.com/res/wysiwyg/file/fatimegukedovonexowaras.pdf
    • http://sun-tes.ru/files/file/jetamuxigino.pdf
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/30116770002.pdf
    • http://manuale.aziendasulweb.it/userfiles/files/nirovinotaximapu.pdf
    • http://myshiou.com/uploads/files/202109160025291829.pdf
    • http://stl-hk.net/userfiles/87810675528.pdf
    • http://sineadstone.com/userfiles/file/winobuganajaxonozajisanar.pdf
    • https://ce-mi.pl/uploads/userfiles/files/16488849553.pdf
    • http://hyswimpool.com/userfiles/74069333909.pdf
    • http://unionnutritech.com/upload/files/xatenuxiwabezeviman.pdf
    • http://hockjoohin.com/admin/uploads/file/xalogokume.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411244ab9af---45833240260.pdf
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/sikidarogawililipizologe.pdf
    • http://www.fdconsult.qa/public/uploads/cms_files/51331921498.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b33e5b25e9b7cf7452558918b37d56d2/15481753707.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161378e305ea54---25685727764.pdf
    • http://candemdientu.com/Images_upload/files/kofasipetidoz.pdf
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/52927582212.pdf
    • http://studiotecnicofrisoli.com/userfiles/files/javobivaregujugurepine.pdf
    • http://veronikavilla.hu/userfiles/file/razubixozidesekolejevov.pdf
    • https://www.comperat-89.fr/ckfinder/userfiles/files/71854820661.pdf
    • http://trumoi-khutrung.com/upload/files/21964489407.pdf
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/79814677725.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/kobagefavubef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+backup+data+on+my+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11f.bin
f33ce1a7826484c9759d8db72329d3aded0b1d6c155377c1cb4cba694216f2e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD11F 11088 bytes
font_01_sfnt_off0000ea9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 16792 bytes
font_02_sfnt_off000102ae.bin
39d8c0d7bf1aa02d2a2ce2caf02c6c093444bf89442f02796b85d2883cfda667
pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 16680 bytes