Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a60688d4540c7f1…

MALICIOUS

PDF

88.6 KB Created: 2021-09-02 11:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a90f91025d07c078da09a3464e7baa9 SHA-1: d146db49d2f42e9126019a4ee7008a780ab72179 SHA-256: 5a60688d4540c7f1a801a35bc3c318fcc483795271822aa8ba2c536111a72ab5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f81d5d7315a---15089967044.pdf In PDF document text
    • http://aa-nusd.jp/63324965557.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/52427942960.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bec1dd2dafc46a5644d642eb45ef1c18/13548694304.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/xijaduwodef.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ee8a4eafa---zelolumiluroxosikaripero.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/58175085272.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774ab25432d---51105006865.pdfIn PDF document text
    • http://getem.pl/files/file/zefiloninejebap.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/29772350773.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a6a105d4c---50840888426.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/taxurekov.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16102944b3dfc7---89099061650.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/lopowenefexelivalutisos.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/26151633519.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb9347e55---96761073543.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/razenivaf.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb869cf2fc---51652533248.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a6e67ead2d8182a15e855f2ebd55febd/27630676370.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/51966063228.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/popofuzajesodorukupeti.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/tasaxuledep.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/gibexodizozamul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=algebra+1+block+inequalities+word+problems+worksheetPDF 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_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 11560 bytes
SHA-256: b9e2557f737489a37a70fec37b4edb16619ef79d33cf36478b09e9a64fecb28a
font_01_sfnt_off00010cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 18120 bytes
SHA-256: 0690b173cb01d57af743d81ed04436963f834bf13f1f57d739dbac5dbb6abf31
font_02_sfnt_off00013b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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