Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f378887f52663d6…

MALICIOUS

PDF

86.3 KB Created: 2021-07-02 02:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf9b5323a2799926db0992c837600743 SHA-1: f2edfdebabac5c73c8d8ac78c608288339e1ff85 SHA-256: 1f378887f52663d6ca96e54dced63a476a33676b6786b21481e578dd52343d8a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://esprimagroup.com/userfiles/file/japolilinegalotukup.pdf In PDF document text
    • http://giasuthienphuc.com/Images_upload/files/gerogizi.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e038e2075---58156199291.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984833b35cf---fivapuneradowezexezitodi.pdfIn PDF document text
    • http://splogservice.ru/content/file/nabogexuji.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/49644165741.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f92a3d079---70009941134.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/mivafebozunukobajexiv.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607db2daebb32---78634660564.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84fa717bf2---xuzos.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a7a992f2---75443529595.pdfIn PDF document text
    • http://c-amc.com/upload/files/76155409643.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///4372220554.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b941c3a6f---60486559024.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/923b77497c3982ecd6955b118e6d1427/14211989464.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/2086948399ce5a5eaec09bc041481346/93421049878.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7424880f5dd90f4f3ddc0f177cb91634/65601445668.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/814419065.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/30174449278.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/8798cea6f55e3598eaa1c4d2936a2e61/44321766568.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c429a02860---jibosemarinulanif.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/nebajosesi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a681ff3e---gofaruriw.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/gabopaxejijafutigokunex.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/pesimidafipunofuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hr+question+what+is+your+weaknessPDF 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_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 16668 bytes
SHA-256: f5c5878a1b5cc455d51a855ad4fabbb64d494c46ffa18bc1783c6823366476ee
font_01_sfnt_off00011b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B05 10688 bytes
SHA-256: 08abd281998586a8e30ea31daaaf247d69bbbb44d16208878c3908a272eafc90
font_02_sfnt_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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