Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a261f45f89567c0…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 17:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3197f9116667c274e885d9d808b089f4 SHA-1: f69d971bc50845dbba8dbd89d155c0658118ddf7 SHA-256: 6a261f45f89567c024f3b1d54a4826573d4711e863a054a43d6edf0be4cf00c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of PDF-specific heuristics and the authoring application 'wkhtmltopdf' further support its nature as a malicious PDF document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ketchas.ru/uplcv?utm_term=batman+arkham+knight+apk+android PDF link annotation
    • http://windmill-bv.com/userfiles/files/dimorigurop.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/ribewujere.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8367099d59c2fa32e04c194b538e1865/sejok.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/50412091871.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/30fdn0kjqettbs4gu2n3kkout2/zasef.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/jofivonuwudizagixifusa.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/mofowomeratikewazo.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/kebakitidesebemonuni.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/63269748970.pdfIn PDF document text
    • https://www.znackakvality.info/files/52634499730.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae0deb5815---81422172210.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/toref.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/virefutupidirugid.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///kiruxupi.pdfIn PDF document text
    • https://flomogroup.com/upload/files/widitominizudorar.pdfIn PDF document text
    • https://menu2uplus.com/images/file/tixetuturajalafosuge.pdfIn PDF document text
    • http://trieuduong.com/images/Download/23905352002.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbce54b2f5---wegepajizarisak.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/rewawavejobasawejejutarod.pdfIn PDF document text
    • http://aprt1day.ru/file/64602661582.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/bujuresejaxapitedoful.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/55499156062.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/vavekozikidumomerazewiv.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/13855300943.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109130801573527.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021918122363671.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_off0000b55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55E 14796 bytes
SHA-256: c6fdf4fdfcdbda9b3ad5c58445cfa92b0060fa9f8c87929c43d5f8f61a66885b
font_01_sfnt_off0000da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 10636 bytes
SHA-256: d01761f0e10ccffc7575599106f4c683507d15844cd46d6708392200d29381e7
font_02_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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