Malicious PDF — malware analysis report

Static analysis result for SHA-256 09fca6aa8f9b2787…

MALICIOUS

PDF

86.6 KB Created: 2021-06-27 16:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 975882e5ddbfd31241dec26c2db36ef0 SHA-1: 5be61b36ab6287f2a3533abf82ce5382459a511e SHA-256: 09fca6aa8f9b2787004eb7700b45749d0dee8bb229e7446c946dcd18cb063c95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to compromised websites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are indicative of a phishing campaign attempting to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=ship+sale+and+purchase+book+pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/605d115c1984b39d3d9cd3dcbea67fff/5085482388.pdf
    • http://czdashan.cn/uploadfile/file/2021043001020573499.pdf
    • https://a2designbg.com/userfiles/file/60508682622.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4265032a8---28527716981.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088fa0648587---purupozaxavi.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/uvpjahpebm3rd9bl0iuhdgkkb5/pedufitaji.pdf
    • http://bebelino.ru/userfiles/file/30924747957.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/07d5a8b17792bb8198c6829c3b488e3c/85586948702.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/tjd4tt9ab89e2r5pde5pkhsn2a/85516813384.pdf
    • http://nwatchonline.net/userfiles/file/38807492670.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28c50bb253---morazum.pdf
    • http://csc0512.com/userfiles/file/20210609024445_5hxpyg.pdf
    • http://adamlegal.com/userfiles/file/50258622786.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c582a65b4---sulovibokujiw.pdf
    • https://mednet.mk/public_html/upload/userfiles/file/xutaxurufolisosivutafer.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/f3ersotqsdvoqi5b4hcnmbtgfd/zufanepukitofozenitu.pdf
    • https://artasedanasingaraja.com/uploadfck/file/wevolikerizuwesisajabop.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6c2549993842f539a3bf4eeccf56591f/85191604474.pdf
    • http://sillajen.com/fckeditor/_upload/file/buwuvawuludofepeja.pdf
    • http://ytbozhuo.com/upload/file/010322065625.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160826c09e74eb---zudutedimilinomovugiruwa.pdf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/fomorezipijifebisivod.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/86589137877.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/24702229130.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 16792 bytes
font_01_sfnt_off00010556.bin
ab2a0bba58f0a26c1ea24670cb2621af4a59e0c01e463c7396ee07875a1ecc11
pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 17656 bytes
font_02_sfnt_off0001338f.bin
299ca2ad2f30354d11708116677735bc82dea56fe3b6d8c9e1901643190425ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1338F 11024 bytes