Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47eb590d9c38f5f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 02:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 478bd1e7972b20da4bbf87c35fd6c775 SHA-1: 96d954abc93f2f9c3f1ba0f145aa3ae1765523c4 SHA-256: b47eb590d9c38f5ff34bb8d89645ef26b4394267d6fbaafef5d0d7ae983e8c58
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=photo+lab+pro+mod+apk PDF link annotation
    • https://ostrichpharmaceuticals.com/userfiles/file/93125953297.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/34816983467.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a143daa0c7---jifazovujemigugujazawudaf.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/xidavosetobusotemaxeseb.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/408bd8f4d2c68026d338d2650810b2b3/wesenibu.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/61164251161.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0b68983e1d65816345b098aaa2d3c43/89406568537.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/zeluf.pdfIn PDF document text
    • https://rjpexport.com/files/vumufirujagofuv.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/41952131326.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/porisukuwovulo.pdfIn PDF document text
    • http://www.moyekolodin.com/files/48677510791.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/nizavututamilozinotetis.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/pigosatidiganamerala.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/51174110787.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/ronuliwexebikidudifawew.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/gorukulexodenexakokez.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/84194985077.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/xasozonogipo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5h8abksu2o04iq9estcuu8npn2/dokagolopij.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/34116341030.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/lilikivodadonexowa.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_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 16384 bytes
SHA-256: e642f07d0b0c454b8b943eaee2656dffd5a4fc81a350b5b2d450ea88bb2878ea
font_01_sfnt_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 10396 bytes
SHA-256: 286d1e17c38a1f4e09f3c8747d79d864efd58e2f2b8d20ab256092c39e6beedc
font_02_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1