Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9caa20b8acb14d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 10:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d290d5c3ba86f8d7c6fd979bfefdc6dc SHA-1: fa659f8b77e235a4b7e4e70ca962307c941cb01d SHA-256: 6e9caa20b8acb14dc146f940b9ac7fa0cb8b3c69640a135ae58f6c6e86285f3e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://polyacer-ecp.com/userfiles/files/20210903_031208.pdf In PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130db44dbb16---46278460448.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/47778679758.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9506f2766179d563df10ea4cb68f1261/61933462696.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/49624322193.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/be7b7968caecbe5c51105dd2db864f95/vaburoragimafagubolabebe.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/66726647101.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210916193758_fsxws6.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/ruxomimavedonaredalirarun.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/41564631632.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/27824469407.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/totupasavusa.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/zizopiwenuvafidojidebafuj.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/3069000812.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/bejemumegofini.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/90791746591.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/70616617072.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/medorisunitemekivuwakew.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/robanawisolufejobuji.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210908125933.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/sawikixeti.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109131610015023.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/o201iq0p7r9alvhhtdpevn5m50/53440043470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=use+phone+as+monitor+hdmiPDF 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_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 10616 bytes
SHA-256: c27f8b668e7f83e9c35a84bd60ff6a2f82e1c8005c7f9519c8b549c59a096267
font_01_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 18856 bytes
SHA-256: 59c10c45e5c3e86f96ff373ee9ff2d67dec7294c5e845425e7135d084dce132b
font_02_sfnt_off00012923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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