Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0c8cbe99d6d973…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 20:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bc6e8cfbe4942cc2ef7eab40a19c80a SHA-1: 35860406281e8b104a3b6088acbbe3f4a713393f SHA-256: db0c8cbe99d6d973420446201f69a6459e1fd596b9b9cf68d5f2af5953b02af7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wx-bm.cn/upload/ckimg/files/202109112303196930.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161350ac2112df---70421303856.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613289c703d61---geganijijaf.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/vokebak.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/38987306402.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380f6cb406e---bilojuvilinugililatiwavov.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210914033454.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210910135936858053881.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/vajaruvadaxiwufijevusugo.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/vusunu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414a294e6d1---wewexiwagisawidapenafufa.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/repurumagifalaxapivutome.pdfIn PDF document text
    • https://12shio1.com/contents/files/25331706177.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce5d1b62360969b605868a4d4ce0f815/8527237381.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d31fccd4119a711ee400be442ed23f79/93677799864.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210916130705314557jr2tg.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/wagex.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/99676163687.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/50701232360.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/goduvabise.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/70574844806.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/33974885757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gta+san+andreas+cheater+free+downloadPDF 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_off0000ce20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 17752 bytes
SHA-256: 7d753a55e6ccfcf1359a4113fa3ce930a84f583dbc15bd149220945828d8bc9c
font_01_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 10608 bytes
SHA-256: aa5ce84ee011691317af3ba399fe146201d768067dbd52be1bbc80b41458c5c4
font_02_sfnt_off00011439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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