Malicious PDF — malware analysis report

Static analysis result for SHA-256 375db570565d9d7f…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 01:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d89c7a6e193777a762e828ffe02942c1 SHA-1: e6df435f400e20b2026c6088776055ac12335e63 SHA-256: 375db570565d9d7f48c12cd0313bc19f55182ad75dd1eb1fe3f275c4b2e8f6ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://garglob.ru/uplcv?utm_term=solar+system+was+discovered+by
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/sewedukifanapefonow.pdf
    • https://myphi.biz/nbloom/fckuploads/file/25443828127.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1i52kf2sk2f73fg1ulado0lf00/77214798375.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad1229d74d---66497620236.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607712167a0af---pezezuzawakilip.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6035d4ae---97897153750.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/tikoxodurujon.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077fda2bbb79---kewijafow.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/2cfdccfb7ee7a9a92cd629e12192c649/33524081511.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/4602a10c257c7f04d8e16677d2933fbb/zugalelisirozilerapuneni.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ab05b195---zepibiribepepegazawij.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607377f6b89a6---76728178670.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608258ec6a724---tukolelepo.pdf
    • https://footballsod.com/images/ck-uploads/files/41262974907.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/410c423ff8d3921f7efcab9d745a89d8/61373919045.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/dp2g4p1men8jos4nsl9j14aqo6/jilagagolemaf.pdf
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/tuzepaz.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fae3b2843631f187b8bf0718f594063f/63973300581.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/49efd05683d6b0dca2fc3089de3b750d/siguvunuduvurigirobor.pdf
    • https://betentour.com/sites/default/files/file/malobevesofepivix.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0a649841---bapofisagizimidadozo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fe.bin
e2c7c4425758e61e53e75bfe4499d9dca1889de37115e3d73968ee5cdd80eb35
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 10908 bytes
font_01_sfnt_off00010d58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 16792 bytes
font_02_sfnt_off0001256a.bin
93575af6b4d04cf6469394386de99e3c3e5071f1d01e0b0079bc5c21297d07ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 16456 bytes