Malicious PDF — malware analysis report

Static analysis result for SHA-256 101607cecf6699b7…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 07:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df8cfefcba6d4956d51e681e114e2625 SHA-1: 06724ed9750ddaf322666e6988f29e0c95da530b SHA-256: 101607cecf6699b7af7a591782d2af7038c37ed763236f19a91de8596fb9c31a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV detection, indicating malicious intent. The presence of embedded JavaScript and numerous external URIs pointing to compromised CMS uploads and disposable hosting suggests it functions as a link farm. The primary goal appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=effects+of+overpopulation+on+natural+resources PDF link annotation
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607307652792a---sozejiruviz.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5e5ce3c3a109c741d95200a57f660a1c/96433026246.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/124215a951cad3dc03d76e6125bd35f0/piniwemegeleri.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d9ae2f1e63007990a0ddd33b269d3684/perajebavelunesi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c9b8c522f---luwunoto.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/mabigokezafajizirulidowam.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f1c9117b87560eb8d98ad6076a2d8eb6/62454261616.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7b8084eb8---rawugo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eea57ccd51---37868966163.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/97760815128.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/judupexejogeluki.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/dokoviwaveburoripiwa.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/10128785597.pdfIn PDF document text
    • http://enewind.com/pliki/file/39719267258.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/guvewari.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/mebaza.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/23502842751.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884fdbec6f7---32916677639.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tra8uib7r6qh1uj2j0s0mt3vjf/supiki.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/52625963011.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/43315373989.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_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 10620 bytes
SHA-256: 36e1b4ea3989bea0717ab62841b5bbc6e54aac3b8d39fd8792d637c4637f46fd
font_01_sfnt_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 17832 bytes
SHA-256: 4a8db3c393e9334e7ac3518e8494207471228b3d0184697c2738aa7fccd00dbe

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