Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d762488ba67f11b…

MALICIOUS

PDF

143.3 KB Created: 2021-06-27 22:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 214cfdb2ab62a446bea54ec7ca188846 SHA-1: 1fa29711b15bdab3a4f8e1ab5495a32ed326bba5 SHA-256: 5d762488ba67f11b310ef61857974a2f38bbaedcd25b22c81bcfb2138138827c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to obscure the true destination. ClamAV and ML classifiers indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a7319361e---74721263371.pdf In PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20376acfe---35763320344.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/22425749140.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/39888365540.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085627d13726---59372900959.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e05733efd88287ded27c2d7bf0c1ca9d/82183992341.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/dfec2558bb77d216b163307b399cfad9/60884202808.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/lotop.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/foviperofotuviro.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/d6a408bab78e718b9678024498c4e757/winog.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98569b60a---mufowep.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/ecb22d723d9608134f404e104a394133/73020609030.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/loridanogatanimura.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0043002745---kipuvudowinawimoweduki.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/20239194491.pdfIn PDF document text
    • http://tipiland.net/upload/file/86827423740.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bau2a0fgmvmi1ifmg5srm5qjd1/70129805401.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7706fe422b---94743609198.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/9484141159.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/72813413933.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a38fedb4e66---rabigalex.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/iidrfkpr4jct8745464ib9ji9e/51957541439.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/vijikiruwota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=asian+american+chamber+of+commercePDF link annotation
    • https://medlineplus.gov/asianamericanhealth.htmlIn PDF document text
    • 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_off0001d070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D070 10576 bytes
SHA-256: e0d43e8739785f7a748784b113084fa4a4220d33624b50b21713e5fd1504701d
font_01_sfnt_off0001e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E854 17964 bytes
SHA-256: fc1a3e9a3d623ba8e9cdcf96ecc93acb2a323fca41407b4e35269ca9f4f816de
font_02_sfnt_off0002177a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2177A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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