Malicious PDF — malware analysis report

Static analysis result for SHA-256 947164c5eaa6b565…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 22:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8b428d601af35f07565344cea85708a SHA-1: 005590a182b7d9bd2cc05036ada31044f8e234bf SHA-256: 947164c5eaa6b565fde35ace2a9d50e9d9c06b45c43d41c5b6431064cb272619
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to other PDF files hosted on various websites. Several heuristics indicate this is a link farm, with some links pointing to potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via the linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vieclamlaocai.vn/webroot/img/files/tegowux.pdf In PDF document text
    • https://epos.nu/ckfinder/userfiles/files/donofezebepexek.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/71919996487.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ad350f81104715e55505b1d0228a0478/pewavipojikulono.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/65708193387.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/tirozikowobiji.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/gumexapemumavarim.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161079a5d7bac8---kujulevakubizixi.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0628995a2b72be57f51d720ae9754177/wugox.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/26978854073.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1f980c4d1ecc563873abe2e98caef4d1/mabitofogogezivirededeji.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/89806762837.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/4603378814.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/94530236200.pdfIn PDF document text
    • http://leguido.net/files/75973137757.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/53964133408.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9f30c592---28445741647.pdfIn PDF document text
    • https://ancoraeducacion.com/images/folova.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/jiliruzizoja.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9d98ae76eec947c4308897fa8da8d4d/fudidapuvekokezesegesi.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/r397bii1bd2vlfcsptaufk17n7/moserejolos.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qranre95dia9p0n9qjii9to9c5/tixaruluteku.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5215ea9b49---60788492213.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/lokokodajixetuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=exercice+sur+les+mots+de+liaison+pdfPDF 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_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 20676 bytes
SHA-256: 629cd21c8957a156f2d7c113f34128b892f6d6d91afcbd960890b79320bdb114
font_01_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 10964 bytes
SHA-256: eb7201b7ce5396c5a7683860ead161360826c192641875dd8a21b646cc8935c0
font_02_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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