Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e99945a429c159…

MALICIOUS

PDF

93.7 KB Created: 2021-08-02 09:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24dc0365306f1aacb7726893e03c27f7 SHA-1: c97acd04c0d7ce5b4c69699208b54e7213f2c59d SHA-256: a5e99945a429c1597dc498859c9409856f457df0811efd0654335a85cc010c5f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are part of a tactic to manipulate search engine results or distribute malware through seemingly legitimate file downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/99315315430.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092bb2f58e36---12005298867.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/40977041643.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a61f9aeff594c31813dff570d47c5acd/mosuvopijotubasidelonexad.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210525103144.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/62994501115.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/cdmchhui90rukcd1mtl6nrhcji/rulow.pdfIn PDF document text
    • http://nessium.net/userfiles/file/13859919433.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc686d8b1d7---wowaza.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5c15ebb3---rakikila.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/12407226671.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e541b1c53a7d65833864e586466f43eb/23509173351.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/rgqji42as0uarrc71193e26o83/29341253587.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/jemuxerak.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0h012ma8hul2g0hjljv0em4292/5292950406.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae60a58947a---xosamupadoguxe.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607989b3966d0---jirabo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a350bf212c---xesew.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/56351623635.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97ae9f0494---tumumeraw.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09148712e8---88655427303.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/o17tjgi34uli61mdq2kbl4u58m/besewubidufizegufejufo.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/muzupabemuborabinaxigere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+does+the+sun+and+moon+tarot+card+meanPDF 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_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 10588 bytes
SHA-256: 34d6f1d8c4db0d19bcc833b31c4a73e267ee897e1897a29501943e0dc5955208
font_01_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13845 18176 bytes
SHA-256: 388bf39e9a7cff8c685604e588dfb75a70cc9e149c4d72f6c1a59cc9baf648f7

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