Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b1e431726ef21a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 02:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e55e094e74b1ffe3063aa875c70b3506 SHA-1: 3088d37724cfb4b412c19bfff1e2b252736f7e14 SHA-256: 00b1e431726ef21a1aa38bf8d789d98bbea3777b46f8b34be60fc487cfe3e717
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the presence of a link farm suggests a tactic to lure users to external malicious content.

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://spreewaldatelier.de/img/editor/file/josupuliwalisajoxirewu.pdf In PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/samefu.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/36923572735.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/dekovovudijopojibawe.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/bugale.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/vetomavuduki.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/xitefoxeg.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888de7044ae---gagofoka.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/37767283843.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63a04e4bb---zidebawabubisap.pdfIn PDF document text
    • http://rentaruedas.com/files/others/12348259625.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/253779f00269ad0c126aa5021ef22558/siderebafamaw.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/bopakexugudinupi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/876b4abc13fedfe3d8066588e0225aa8/zubaterajurodadale.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf6bda005e---81931751058.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/gidokazo.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/dominunenajo.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mpd82v9bbd59kagroc78l24r6d/neregevuwusisetaz.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/26646293864.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/33023913258.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3kvrnt790itdp196o8kcjc4u51/jowiziwezekimujedura.pdfIn PDF document text
    • https://terracell.info/images/file/ruvufisokozupazixod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=driving+permit+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_off0000d5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 10472 bytes
SHA-256: 5dcc71dc7c463dcd3008e8073d87e9f928580116bd4db069ac8c3e3e57cf08e3
font_01_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 17112 bytes
SHA-256: e4640df230ddbceb5b089e6c871fcc5dc2c081374105b8e5062015e0f8668493
font_02_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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