Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d4d5763c3c9e7b…

MALICIOUS

PDF

68.3 KB Created: 2021-06-18 19:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 749f8f358fa92a367f0097ec4aad449b SHA-1: 24c07d9ab7c55d52e3323300ff5aa0dcfc70cd67 SHA-256: 64d4d5763c3c9e7bc48fdc94806492c570dfbc740fa56651469f41295867e7ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting, suggesting an attempt to trick users into downloading a secondary payload. The presence of a 'download button' lure further supports this phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://kuhomania.ru/ckfinder/userfiles/files/kenalisemoju.pdf In PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/viziwinazelepone.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/69sjshvg9jk3dbo1fr4l481q35/xelukalekuv.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607497569ec98---68057233625.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf34b67d7d8---zudexazavubinojuvaseko.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d9199988bea76dc357e6567fa13ee9c0/90753382634.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a091418b5b1---bupikidijilumudevavobus.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ceaba5b9706382825cbe1bd36cb858e3/95803021530.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/dbb159b6baca37376febb7c8fb247478/17733588384.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098f68264dc0---69519845284.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9e014511f7c1524b8e3ec23b12c0f987/goxiromezujumuzanog.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/gphs4kako1t1bvv4a31mg30t46/72117049726.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/zapibawed.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/budulutosomorexo.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889e0e4705f---teniregoralatixan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=yellow+steve+skinPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C5 3108 bytes
SHA-256: 2ec285386f6fde803dadc118517c1f5cf28ed549c65b7b9e48f26652d21ac8c7
font_01_sfnt_off0000c2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E6 4336 bytes
SHA-256: a002eec7a184942e747e81768cfcdf5e810ac103e19e5b1f3ee82b3c4459a01d
font_02_sfnt_off0000d1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 10572 bytes
SHA-256: 9e7a6896e574d68d8e2856f2a927606d1ff42e5832f43bf79857a107a585f628
font_03_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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