Malicious PDF — malware analysis report

Static analysis result for SHA-256 91227be495b3e024…

MALICIOUS

PDF

93.4 KB Created: 2021-07-30 13:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 19ea19564cac7d80a17ed01113830f8e SHA-1: cc6b3aecae3b2463586173cea82e5cf4f95e06ec SHA-256: 91227be495b3e024326e80a67ae9b70153a3b246ee7452c1f6a49b773a26ee13
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/r0qkbn9n76rtf01hvvbiagkj90/35197538128.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f88974e51e5---50468910637.pdf In PDF document text
    • https://dptech.vn/uploads/files/80630285671.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/foletezimu.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/goxetelivumupanerisozevem.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/48844508889.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/32089580761.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a802f1b9395---kikelebomoro.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c77b0d8aad---tipibusupep.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/wuxebex.pdfIn PDF document text
    • https://hoalavender.net/upload/files/rejigulupujonujep.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/r0qkbn9n76rtf01hvvbiagkj90/35197538128.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/0c06f003e7970d74e439a5eecbd9a82d/xomojowuxipan.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/cf37dc8bdc01985dad9bf99b834b6e17/likax.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/94021496768.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b825e278fa3ec8b48e18f5dddc999d04/31648440487.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/gj59h9qcbsjqdake124rskcfji/pibamukonim.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1983d38bc---dinululozatetegobafidu.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///rosigaxufuta.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210621_043609.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5n1l9skdnjos7gvdflo1bhrst3/garezazovugajukipugupim.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/54340230e2e246323e9dddfa04263b9f/23264714027.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210619090544_jr3z13.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/15951429817.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff9eadb79d1---mopaborat.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/6gi8l0iqfiemaj00g22qgb15g0/jevofofadebejezamekof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=3d+skating+games+unblockedPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 11020 bytes
SHA-256: 7588a243bc5c463fb2933f462e5a65ce44981e224f75258fc6ad6587f3977cd8
font_01_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 16632 bytes
SHA-256: 680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb
font_02_sfnt_off00011e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13691 18416 bytes
SHA-256: 68bb3df5802c43e7df36236aa54efa637095f5bb95290b7596803aef3d3b4669