Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b601ae149eff1c…

MALICIOUS

PDF

91.8 KB Created: 2021-08-21 08:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dad4a63c0cf963c3d0d2cd5bbd7b376a SHA-1: 9ab7b0e2eaaaec103634db400f990a3b4a372af4 SHA-256: c2b601ae149eff1c40ab207e10c0134c9e89a0f4d5ad7d112c9a1b546d406e58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://irths.com/upload_files/files/puradekiji.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161030994d1f0e---29411841816.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6764bdb7---tuvokizufifiwusipofox.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/28103113900.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c22991178198116c859970f5bca894f8/kejirasepalokijerexixu.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202107022252.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/jifegoram.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/11362018923.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/dodizakefivazuvezib.pdfIn PDF document text
    • https://bursac.net/userfiles/file/dowufabaruxutumo.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/kesarifosoxojubalorololev.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/54956246126.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/zibiralazufunabenojezu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0f1f13f2d---84682283371.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609250771ebec---livifunuwifavagorojad.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/xokixikemojerux.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/fidilenafole.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5059bdf64---sujobo.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f1a74fb1e8bc4ae8e7a5449d4afa4722/merimapotepijebewites.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b40c10d2f4c82e65e9b066ed2a05a2bc/wamofaxafaxutulanubezej.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d3fa0ae81e8f121d2a99d64d172c9335/jiwenibeluvadilitirinaku.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/84ac2239443393c63af0259526eacb44/zuxuribebuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+start+a+house+flipping+business+redditPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 18092 bytes
SHA-256: 6c9ad8f3864a65d42b7d7b44d46434a0f065d9f990bb52af25986096031010f7
font_01_sfnt_off00012cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F1 11096 bytes
SHA-256: 7837cb3c0c39cd4f2109444ff40e6d5897f0464a8b039b6530181406e3bcd79d

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