Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10aaf21bcce4754…

MALICIOUS

PDF

81.6 KB Created: 2021-08-28 14:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0c8ab8c89c492915d7838e2e8a8ff5e SHA-1: 9b125c6901467c1fe06648333a087195612fdb86 SHA-256: f10aaf21bcce4754b3e47fb73b70e342cd43beb154165ef143a8c63b7cdf1c4e
156 Risk Score

Malware Insights

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

The PDF document contains a significant number of links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. This behavior is characteristic of a link farm designed to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://tndgdemo2.com/ckfinder/userfiles/files/76730775448.pdf In PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e50369cd5f3---wosudovutevuwenuxawu.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jufono.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/vibolaxogolu.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070613372383.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f77aea2be.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/49056417552.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/56982781507.pdfIn PDF document text
    • http://meskerjager.nl/media/files/sefumuduvukapipegomuto.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/48233442220.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/vamemoketulaxefus.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/66526213858.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcc956763f---nozepunuvigegeme.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ls0665hf8s07hik62nfjlsicm6/zopazuvujipa.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tia1lmg9gslrsbdp9b7qgj3sk4/50087394251.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/13513823913.pdfIn PDF document text
    • https://rotherelectric.com/files/wepijowo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ee0434a7---30603129639.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607218de77348---bibaruxebow.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/74288580167.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1611eca0281271---doxukeneluwafobavikitori.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/90112164225.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/74721993636.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/jitiruzepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chapter+14+chemistry+test+answersPDF 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_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 10836 bytes
SHA-256: b436cd55752efc65280df067dd897cac2f23621366c119cfadc0f2673fc7e14b
font_01_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 17064 bytes
SHA-256: 7da08ac286d196f9226a94f2d1c534a435f32f1d62c5192a46ce38ba68db9e90

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