Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aaf52b967891567…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 17:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1054c5b61f39ccefd6fab9ade67672d5 SHA-1: d2f5a60e0cca5d8f5680389822538c87ffebd28b SHA-256: 8aaf52b967891567f1a10f03d1e19d68f7600c37c0f29b2fc5129b5d403cdd8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to lead users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=change+app+open+file+android PDF link annotation
    • https://tempatpasang.com/contents/files/5083938528.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/53243839069.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wumuzakixoxo.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631512976100337377.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/mivozepev.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/xutorewozig.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/gazonitot.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/36454943428.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/ketoves.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/20750926580.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8816b8aaaf158ab2a7da90fbb8a46c2d/3995714684.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210905_0A90ACB3A5F5A2E6.pdfIn PDF document text
    • http://ned.ru/uploads/files/64425218265.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dbed3e4a---55866180988.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/91420296194.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/kibawiluzafu.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/31224249034.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/peguxiw.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/kepilotukagabesovud.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d7e940dfdfed33b2abfc235f95f625c7/bifulije.pdfIn PDF document text
    • http://voijin.com/userfiles/files/bonosemed.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/libeviwiwuwalolat.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/bixatobitixepan.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/rudetipiwixa.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/84586908609.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_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 17516 bytes
SHA-256: 3c254d953b80dc1a65ac9a244cf7db394f350f6ffa9a3ca11d2e16d88f0a2d26
font_01_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 10540 bytes
SHA-256: 911c7872dff6fc72d4f1cdde04c725d28a6f8e403c1dfd11e32cdc0aacfc38a7

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