Malicious PDF — malware analysis report

Static analysis result for SHA-256 566098e482d6e43a…

MALICIOUS

PDF

118.5 KB Created: 2021-07-03 03:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d7d1ed7fab734f828ccdd1d51478fcc SHA-1: 55d5e9331170268040a97260a5e573d5ed3c85e4 SHA-256: 566098e482d6e43ac4094bd9f55789da538f80c3857859ec29cd8ecb1f9ac95e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9688

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb20c2c6d4---zadiwiwidodesoniwow.pdf In PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/80614422902.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9be45c602570ec828b0dfaa4ad6279d6/pomagolakudivekazon.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/nugexudoriruke.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/kowusuretemuwa.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/fixewipilu.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/6494575927d236b5c34a0855ddbade23/ditoxinu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/85256279103.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088ac963fd19---77759730204.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb73861d4---94152973394.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f1070824ecd7b45c1e673793801d5fd8/dinidufoxowito.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/vupujamojuwubikow.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe4c04c512---77819423614.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160707df61b43e---70237221414.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac843191391---28687883947.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/19284479637.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f69454f9d5---ruburizebowokajibazugeto.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0271a849b0---juluzovoredafijo.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a4971e885---80994228150.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071b658cae17---60790264445.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/4022acd35bb4253c2e4c3292a931cb45/40652841799.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/14598029122.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c888d2c9a52---wawivopudib.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/p2arfn6fgaem9mr8b8hlkur0gp/48896333227.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/d52db413586740f75c21468e9032e83c/misaxitexakiviruvitigawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=angle+between+two+parallel+lines+isPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001489e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489E 10636 bytes
SHA-256: dfa13e99573b47ddc41fbe1cd5aa56fdc47f12fe717f600ddd6679535aec37df
font_01_sfnt_off000160f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F2 16220 bytes
SHA-256: 16a72c2fd11e10e3126b62e046def008aa0ade76e7b7063adf995289b65b935b
font_02_sfnt_off000176aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EB7 1684 bytes
SHA-256: 3fec8e686217411fedf5c747a5de1eedb32ae291f30483ab5b52b166ab10a491
font_04_sfnt_off000196b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196B5 19464 bytes
SHA-256: 8c76689079a58d9a0ff27d345b841b076d961277be397c5ece5314df8eb64a04

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