Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43ba10330b2f704…

MALICIOUS

PDF

90.1 KB Created: 2021-09-02 17:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0926115e94be37237a5a38df0ffe3f78 SHA-1: 3f3e16c484b6de80a15df36df2f33842e752bdce SHA-256: c43ba10330b2f70427096ccad5a3379d24d3ec46f38fb97b1a26fadb405f62b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the URLs and the ML classifier's output indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bearings-home.com/userfiles/file/danijevaja.pdf In PDF document text
    • http://goodfortune.hk/UpLoadFile/file///26087773070.pdfIn PDF document text
    • http://staropolski.net/Upload/file/91454763360.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/60640831819.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/visovefafafarap.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/bazejatedipirisinukuk.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/duxezavazewakovepifipus.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/nuxivurusetek.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/kapopurokumov.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/xabixeweno.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/98083408542.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/wuvinepajuxawi.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/66818227220.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946877e7960---5330210481.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bkkcvudpgt16hd1vvu38dtd9mr/bavifipadobasawisa.pdfIn PDF document text
    • http://vhktn.at/images/content/files/59840544670.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/27646159311.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3da7dbf2a---niselozidezuvu.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/31103524747.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210809080439.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/82206170188.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608528b8c7162---85950046769.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/32201555693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=peaceful+pill+handbook+pdf+2019PDF 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_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 24776 bytes
SHA-256: fb0038ea47ae077e1e7ea2d540754e16c0714d48fe036fe16a56df8c9ba9847b
font_01_sfnt_off0001287f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14096 11144 bytes
SHA-256: a8d31258b10aa2c908805d90381eb6369500b99c6cad30e7413a8709f49accd0

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