Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ccc7b5edc9e87b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 00:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bc53807d318c43b9308d916a9943c72 SHA-1: 28fa60a46307edba6a51029a6e07676260903a49 SHA-256: 42ccc7b5edc9e87bcf2f7396af516b06ac3176c1eb15b886e156644542182a95
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wernitznigg.at/files/23219168101.pdf In PDF document text
    • https://suma.ca/upload/editor/file/kibonubajakipetinulofa.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/tekimigukukisaxenamobasin.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/76041096193.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ce6721238---volugozuwotuxupiruwakixi.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/moxewumomarixu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/eb468256aee94e7145d7c27918507332/muzida.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/6199522886.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410ff66fab1---50946293565.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/zowezusovofatozoxawele.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210902145401_xfgwg7.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/3774831644.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8ae5ae01---93404364754.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/71776290935.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1b209a2a---xonadejanid.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/10531010739.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/wokuwomabot.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/27079012559.pdfIn PDF document text
    • https://km2804.com/ckupload/files/fezenufotodefikusubo.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210911114609.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/65851222243.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdb802fb9c---bejigetiwulemareniru.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/timejemikapotelurirere.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/62351850558.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/jowopowebojajatemipipux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=thor+ragnarok+clancy+brownPDF 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_off0000d26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 19152 bytes
SHA-256: 53c4d71421d6559d712f11599f8d6b316d83d8b49f4bf956ad9a11cf4037a120
font_01_sfnt_off000104b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 10412 bytes
SHA-256: 55e1faa942cba01df2302eaf8cf28d9c600d31e212c0ddff4766c1b82b99c84f
font_02_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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