Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e032caf51e9d13…

MALICIOUS

PDF

90.0 KB Created: 2021-09-19 00:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7577ca4758c46a59f28d7e7c8ac385ef SHA-1: b319f497fd63867ff4dc4397426517df8687a1c5 SHA-256: 22e032caf51e9d13d81428e76a61aeefe9bc012e4206af0310178640885903c9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://autosvilar.com/uploads/ckfinder/files/50666298718.pdf In PDF document text
    • http://nb-magnet.com/upload/files/98507898025.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/laxeb.pdfIn PDF document text
    • https://robertbah.si/files/file/40246313397.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210917_085728.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161412a8f74a53---59183677462.pdfIn PDF document text
    • https://ms2oke.com/contents/files/11943052584.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f5efc4a3ae1494f851fce410b5bc1739/65948732502.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/10398771473.pdfIn PDF document text
    • http://nanopena.cz/upload/file/20522869792.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/29650272671.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613082e125498---wawemizufinafobiwinof.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/xikuxotopuzopumujirinu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d6e9d2c7---29526172524.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///16844270350.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/52413497130.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/6ovtlh5rj1qn7d64vqb2hf5cv2/25336322902.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/71011764675acc7aca78b7b2dba74c62/nutukojakuxiwuwogoviga.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e8b1d9465f659fa34ec753bbe2384cae/xoniv.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e89b318d3---46897934535.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/78273387060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+hard+is+it+to+learn+android+app+developmentPDF 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_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 16996 bytes
SHA-256: 109d0d848703084d27ecbe939fed9c0463eaf3d055843854f8359369776c5539
font_01_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001413e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413E 10800 bytes
SHA-256: 38feabc735737b31efb7fac009476125bc5fc0454797b820d82fa9e411ca8297

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