Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f54e878c530856…

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 11:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 910cebca3fd10e4766f6a1f4c77d7230 SHA-1: d328bc6b87cab11b50f5a3fbd502b954a0873fc7 SHA-256: f5f54e878c53085605cb450e119ab26eb104e829e75877fd39318f195ed64cab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of external URI links and link farm indicators strongly suggests an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://catamma.ru/uplcv?utm_term=5+ethical+principles+in+research+pdf PDF link annotation
    • https://nitdgp.ac.in/uploads/userfiles/files/31855070130.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/iujckjblpd0rt1dligrejvigs3/nipepe.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/6577405553.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/31m0l4sedfkm70afgdjkb9bgfm/18322792918.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/64475975441.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/jelilofulononabuno.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddd268e687---jokuzakezaragoz.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/44784782745.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/vawazuxetupavimesimul.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/11958918858.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796fbe7ae81---53189252626.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/dovipozono.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/80639149081.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/13425699633.pdfIn PDF document text
    • https://cncunse.com/d/files/vemerofunoduxoxasa.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160761cdcbd0c3---77177653340.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/dilatujedigizowixemi.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210826055451.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a56566d20ad---lexidowokejogofawi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/755c6ea62d5648b06d3f6a312532ef9e/karewaxawivovumijuwig.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/13915134228.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///torusewataj.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/lenodexuponuxup.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909ba69b1c7---jukamuvepitorer.pdfIn PDF document text
    • 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_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 10636 bytes
SHA-256: cf2d86dee906446cff0a5056b307dfab4936f72b72e912d42127cdf913bb0dfd
font_01_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 17248 bytes
SHA-256: d43f639dee5a4a7d01698c2b73b265e9000378dd42f012a8ccdea1f01a319301
font_02_sfnt_off00014c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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