Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef82a16882cf9ba…

MALICIOUS

PDF

85.2 KB Created: 2021-09-15 09:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d15cd21226a443949c08b3881be38ee SHA-1: d8af90f6ba5df44f788872f9a4b0162163f93faa SHA-256: 8ef82a16882cf9ba6cf5adc75bbd8ab135cbab880a0446423f8a5d2cefd0030d
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and URL patterns are consistent with known techniques for luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=top+offline+multiplayer+games PDF link annotation
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ebee929887eb3caf1a74ea8112dce7eb/14373293849.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/35623289881.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360f350d267---gasobizuwogiji.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/milawefuluzijesijiv.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/6834005920.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/fularosodepedasawufivap.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/82112654692.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/bifobenutumokujebarijexa.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/25bd2f2f25d375294de67017f71f8586/fanadezufifitirus.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/vinugolabepivugekef.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/8416268237.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/32525439911.pdfIn PDF document text
    • http://dogable.de/userfiles/file/56108313909.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/fexoba.pdfIn PDF document text
    • https://ccskin.com/geektic/files/38973038144.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/58276539326.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/zujuruvizawuvoxanakiwok.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/47784124216.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16141467acf942---10290882189.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378f274c8c9---dotixosuzisaliboj.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feec4d5b4f---14387418826.pdfIn PDF document text
    • http://mutitar.com/user_img/files/53795896655.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/tizenusajevupe.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/87303962171.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae4aa5856---80130345397.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_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 17384 bytes
SHA-256: 8ba88f4b95f847c7296919912d92b524d097d57cf4117f9bc393b3e8c863bd73
font_01_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 10880 bytes
SHA-256: 90014325a3fd6593b58c5729a777a7a2ca0871e88a95465ec7b4cee8de3d2ce3
font_02_sfnt_off00012f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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