Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c6f487a1712347…

MALICIOUS

PDF

94.3 KB Created: 2021-09-08 17:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c562d5c311780ff96ab08a9cd48e5d64 SHA-1: 3c3ac1ac6ba1ef928b6770b556081efa642495ed SHA-256: 10c6f487a1712347359c196d60bab708fa5fb620a60c5be50439e761801087ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the document structure and embedded URLs suggest a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.schule.havonix.com/ckfinder/userfiles/files/10908318750.pdf In PDF document text
    • https://raselapp.com/userfiles/file/6687041685.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/34478220570.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/658bd19b4ff130db425c21a0f6b5e5dd/713246500.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-7/20210907062548268618.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/xuxakazikapowo.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/38471181522.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/77716519166.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/17681500152.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/tajunezagipaveb.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/viluxawipo.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/59248428176.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/80604804049.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/jakafo.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/lowolamikoxawerozudoxabit.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/tunuwugutedavidokeju.pdfIn PDF document text
    • http://keitbg.com/images/files/35938282873.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/nakesoxadujejekoguduri.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/xurujuzepujepofifedug.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/48754593331.pdfIn PDF document text
    • http://lex.tj/img/file/varelatugigopuboxok.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/nepql1flst6bn6h9p9qf0oiau9/66510847188.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3ebcde80---93941600930.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/nelukenefurijelo.pdfIn PDF document text
    • http://huiking.cn/uploads/file/040829221322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sni+minyak+sereh+wangi+pdfPDF 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_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C2 16476 bytes
SHA-256: 4244bb1fd10fa88bebfb2a61c7abb0a9a81bbfb0d39b7a279a776ca24711dc6e
font_02_sfnt_off0001528f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528F 11048 bytes
SHA-256: 08b44c073495296cf4563c82b9f28e06e4f288b4b2a2c17d60e26f2848c81b0f

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