Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d58c425cae0e26…

MALICIOUS

PDF

84.9 KB Created: 2021-07-02 19:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d4370e16420db02b25bb3820fb6cc485 SHA-1: 039394f881ba212835ee3a296518dd0961648d79 SHA-256: d2d58c425cae0e2663e54c8174dc5005cae30ed3bb995b2a76fe5282b8debeaa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs suggest a phishing or malware distribution attempt, likely using a spearphishing attachment vector. No scripts were extracted, but the PDF structure itself is designed to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=what+affects+equilibrium+price PDF link annotation
    • http://eros-arena-reutlingen.de/eros/userfiles/file/87562989535.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/lafutuvanusoxasaru.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/7441812732.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607de167952b7---xusabinegebufebulijufi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7fab3343---81298923497.pdfPDF link annotation
    • http://soluzionebenessere.eu/userfiles/files/68675797506.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/28991106008.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/tosewozafaboxazavijo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080928fbb513---mitozalo.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/65414108259.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/nigojimipilexukiburago.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b61ad0efb25---12927703803.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/44815000967.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i20u0q0v29a5u5qihbcvmiasj8/vigofiminokoravatirobumox.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/59704668215.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/gofolativowug.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6a2b7f4a5afa00d271baa30691322741/60394356343.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/66e46ca245060b1b76b8787a380f8bce/xemorijugoregopivu.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/8316507269.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/74433881772.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608954972070d---foxudisezanufozunav.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae179d29d8---54400229984.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c188702ab---5354440183.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/tv375ot36p93drqdmghdic0tt2/71961198432.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/lemetinavijupino.pdfIn PDF document text
    • http://ridendo.cz/files/file/lexupiwupokotedivemez.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/c9ad56f7ff496a8b47b59244fba42806/52587450647.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_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 17032 bytes
SHA-256: 354024d3bf2266f817cac5c891a60adbfe9c2320c9726d3f0401946cb3087714
font_02_sfnt_off00012ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE8 10900 bytes
SHA-256: 0d6020f7932d4f9efa50b19dcc6017b810f24bea71fc74b0bf7598c2a240abfd

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