Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdf0ebf963b3a36…

MALICIOUS

PDF

85.4 KB Created: 2021-08-16 18:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbfdafaf71bf207331b98d030ba5a94c SHA-1: d8f86b41947c0482aa507d3619578274c3511b7d SHA-256: 8bdf0ebf963b3a36955cfdfc4ff33e131a235bf7c4092ea198ea659af10a7954
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://medvor.ru/uplcv?utm_term=what+is+correct+weight+and+height+for+age+in+kg PDF link annotation
    • http://ayurvedicclinic.org/userfiles/file/24262172363.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aac339d053e---luxatelelojedepo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073952ba5717---35684931971.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edee28a4c5---pugeduvusu.pdfIn PDF document text
    • http://agrion.org/upload/fichier/70332041106.pdfIn PDF document text
    • https://artenika.pl/fck/file/mowuvezobafubolawulofu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xaxogikizo.pdfIn PDF document text
    • http://tfforming.ru/d/files/66918769512.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb2be99af---1018682964.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/49322024699.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b839501f---lijanota.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/16476189648.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/434103e29ea49fbad789c6d9989c56d5/77106388464.pdfIn PDF document text
    • https://dptech.vn/uploads/files/filakuberipinamajovurobar.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/83330994133.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r2oudsddngkt6rk86h9v4dl6jk/1889393361.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/tazuzibidavitanapusubofi.pdfIn PDF document text
    • http://dnepropress.net/files/file/48236607687.pdfIn PDF document text
    • http://standardamulet.com/files/files/dipusuwemotinunenuvon.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zetakujagotap.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5258d2e5a54d760fdb0fa23f853597e3/31975983366.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/jisus.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/94353160190.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcec316da5---62662250940.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c2b914ebc---wogunurufid.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e9c532ae15135a5e014a119c81740b14/tupumibexoxufa.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_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 10880 bytes
SHA-256: 17880c4a4a4acd168209a7f8db1e0af8617eb65f2836a102f61c280387e0ba56
font_02_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 16912 bytes
SHA-256: 01fb3bee68dad55f8c530c54613ca315112f88ff984bfd24d0f3911abea526f0

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