Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4b9f91acd8a661…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 10:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2416a3bf4da798591eeca18d4f39ed41 SHA-1: dbee3cb49ddb5f57928153d7c9b6159bab9f7df0 SHA-256: fc4b9f91acd8a661bac3d97bd4057ceb0717439fb084b39e310ca4db339531f2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://prime-standard.com/piceditor/file/41709232001.pdf In PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/38383269289.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/8uq3cbc5qp83gt3o9nh5jp4qm6/9956044694.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/56359819904.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/af751ed412a35cfd5083069ea684a2b4/73026281431.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16235792860982.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/87786583420.pdfIn PDF document text
    • http://museeducuir.org/upload/files/wutazudewavape.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d935904e10---wutetizu.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/48893245329.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/gotexeradumagegudip.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9adc91019f46ee9567f4cf88f6c6cac4/83539035334.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/xolaxevejatobekoka.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/67324132626.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/tuviniviwugod.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607624cc4e1d8---71616433895.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/57627333007.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/16341261917.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/4939665536.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/09a361844df4ec8cc92f6d66ee858a8b/kuwefusilojavelosoguse.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/16952278270.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/78cad78be23e3369644488a661edcc14/16663436839.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gd5m35si37f5gf0891nps81duk/josopapakawese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=democracy+in+the+contemporary+world+solutionPDF 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_off0000c329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC329 11080 bytes
SHA-256: fd995926c6ebcace1e112a347cc825565fa1f249cbae522cab4ff36b47225a2d
font_01_sfnt_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 16904 bytes
SHA-256: 6dfb34a3df8a77d740ea19c1e8d691fff5929957e4b7e95a685e8a1c4ffe9882
font_02_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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