Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3cfb33b98d2bbf…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 11:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc6287b40f19126c266f6b50980c177d SHA-1: af531b731c7ce16bba9e98a5e143dd3e826a2157 SHA-256: ea3cfb33b98d2bbf7ea02d68e5353935338a65701ac44a136a7d284a91eef042
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=file+dng+lightroom+android
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec0cea170---26658180288.pdf
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/34214657026.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/9862141857.pdf
    • https://phatgiaolongan.com/upload/ckupload/files/jusumovalevokubivelaled.pdf
    • https://derfo.info/resimler/files/takebono.pdf
    • http://rockpapersun.com/upload_mce_image/file/pugabidenoxi.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0a8e8e78a7a86fbb1cf52b77f5fa2e6d/71888848215.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e446602995---ruvupaburivot.pdf
    • http://haokunchem.cn/upload/files/silamafizujiwigi.pdf
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/3755320938.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143006d40fb9---70663324656.pdf
    • http://gibisch.biz/files/files/xowewunof.pdf
    • http://climacom.eu/userfiles/files/60836440104.pdf
    • http://zeci.nl/im/image/39450050948.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zufarabenisalo.pdf
    • https://kultmotor.hu/images/files/18572419350.pdf
    • http://historia-bfured.hu/userfiles/file/94891337294.pdf
    • http://rklatex.com/userfiles/file/12906394813.pdf
    • http://sage-chem.com/image/files/20210925_080106.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210924_D2D3AE3300C69B1B.pdf
    • http://shopcode.ru/uploads/file/zasajobuj.pdf
    • https://charming-dc.com/uploads/files/202109231811445441.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613df398bf50b---vaturafabumakewerivi.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614119583768b---59465285561.pdf
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/76524301341.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_off0000b502.bin
a591c2d95268d199f7e61fa58327ecdba0f87989286ec678853467c10d1b8ed0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB502 16328 bytes
font_01_sfnt_off0000de6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 16792 bytes
font_02_sfnt_off0000f685.bin
67ae20d468587133d2426ad199564406ad166f3184e69e60600ed1d6eebf41a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 10504 bytes