Malicious PDF — malware analysis report

Static analysis result for SHA-256 5717c6e3ef6c93c9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 03:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23af8f8677c0022041d0a7da5b855323 SHA-1: b961afd322121f8c2c1ffd7b94b76fc243560945 SHA-256: 5717c6e3ef6c93c9793f78df19e31dc8cef2d2be8111387ddd34fb9059a510cc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

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://philabc.ru/uplcv?utm_term=coloring+books+pdf+free+download PDF link annotation
    • http://pension-erlkoenig.de/img/editor/file/wewibe.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/85e4b485ff8a0f76c0ff929ae268af51/63951252363.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/4342637516.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747688cf0a6---40420587298.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2976a521b6ecdd7bb6a1e0f80b6c3587/518004285.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/somuxajogoladoxedifojoma.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/tudoduvupasefotipijiwawa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6159d3a4d---janoruvuduturoworudivi.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/zomitimexawilexiwepito.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/bozatilajo.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/16780214959.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210827_135430.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2045168c9c2f0ab4ef13f67d0b83560c/62613492613.pdfIn PDF document text
    • http://valeneighbors.com/userimages/vofosofiguzemutijaguw.pdfIn PDF document text
    • http://meuseguro.top/fotosempresa/files/83553487213.pdfIn PDF document text
    • http://leguido.net/files/46631819002.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d5d448d0442a1a294a51248fefe50090/80992401671.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074491cec421---rilovunogufadadodevaneda.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/98982975993.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/gekaxutulog.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/begofojikoraxekewofutotez.pdfIn PDF document text
    • http://maxbrio.kr/files/files/41027279816.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f608e5a3d9---pigepavedekizuse.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/58587955245.pdfIn PDF document text
    • 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_off0000d55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 17576 bytes
SHA-256: 2affd4b1064c5c815e6740533d07f2c5705420f118f7fa89adea6de38fa31e2d
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 10924 bytes
SHA-256: 441ae55d0627ed1e806a541160dc529eadbf084bbae26581b692e959a268780a

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