Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c46a4982c07d5d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 18:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd15d871b0a1a2a5f8a0def1f63b21d4 SHA-1: fd1d58fb7ce7b23c051b5c544dbff69ff074de97 SHA-256: 15c46a4982c07d5d3ff8c85a88835952212eaf8d4413660e58ecded08dce4d6e
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm for SEO poisoning or phishing. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification further support its malicious nature, pointing towards a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://valeneighbors.com/userimages/diruzubobitexaxumu.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b67d15f1---nezewitu.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/79750726700.pdfIn PDF document text
    • https://coluer.ir/documents/file/xijimokodufegusebikab.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/mope426u0e2c4dlsjhulao1q5l/dudojivunakewerigewak.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/tizitanegagirozazum.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/puwibadobokid.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c5d1b17b---fokovusoxog.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8343275f8---44639422020.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4t7sjivd6bnt6q7jaa1c252q12/95644290358.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f221f2ed---22111213600.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/56308475495.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096e223b97fb---rumujoxobizaluniviwek.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/259d3a6408d74f1dac7c8caf267c8280/lilumafatowu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/56ad5ea0a420f251ca8a43a01721b033/kipepanutetu.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/xoduvumitis.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/wixazawidib.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/nepizomowubazi.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/89570988120.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d3140f07---21573183107.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc6e5b10c6---xaseloxojigexorik.pdfIn PDF document text
    • http://haphadoor.com/upload/files/binoguzilufiga.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ee926a93c---69850615239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=aadhaar+pdf+password+remover+onlinePDF 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_off0000c0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C5 10800 bytes
SHA-256: 1328aaf909d4e6def1b606e937ce9ee2bb7783b17da7b0cbdbe1f628d83466bc
font_01_sfnt_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 17568 bytes
SHA-256: 1532b973ebaec2e52acd192b96dc7bf29de30ac889e3c82ec92e3f5abf5d68b2

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