Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9fe19874d48694…

MALICIOUS

PDF

84.4 KB Created: 2021-08-02 04:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 783d807c1003260e019dab0515336e22 SHA-1: 512105ee7d17734a8729cbe0a616d5a024b4ee18 SHA-256: 1d9fe19874d48694164cfd2b5ed450e635a1a70e54f6a2657dde022859cd5a6f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/384862989db57939448c4bde452897c2/82207628181.pdf In PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/lurud.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f81a235c---ditamexeniwabof.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23519c9143---ragoxidetilesowulokuzopu.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/kutijirekefuv.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/u1dt1plghhomee3f6aqcqdprl6/47058159615.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607574a71358c---gotolaten.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/43747016550.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/83158246362.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/13758464255.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/wosedarikemu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c77158e492b---59870082799.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/8gbgfsaq5qpgagd8h3jat205l3/rinirujal.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/abu59tlruuk56lbn0ttp523hd1/5058169903.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/sepezibomalatulobu.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/jekigobudojikoli.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a85330ba62---joveparunepedoxavewo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7979f0177---pojajulaxibewisi.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088026202e6c---25863538135.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/figifilob.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c83dd8128---32172641297.pdfIn PDF document text
    • http://dzbnf.com/upload/file///norupipunado.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e654cca1b95---2855415405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=taylormade+m3+driver+tuning+manualPDF 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_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 10840 bytes
SHA-256: 4f27f81ae3b693565ca196bc6ce3b2a9fd47b8530b9e19b7dfad6ddb256c3523
font_01_sfnt_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 16632 bytes
SHA-256: dde386c45b131306181d769b1221e1bd7f9022cb506995633effd18e6a6cc8fd
font_02_sfnt_off00012aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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