Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a1da8baa3ba5f4…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 02:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 65afc1b28fec51b11da696c0343d3a8a SHA-1: 6f6a0ba096176c440ed40bd5cb7428e0c7f80b15 SHA-256: 97a1da8baa3ba5f429200a328bf5f8e8623e9107817c9169fb34931bab8c0c91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=decubito+dorsal+o+supino+pdf PDF link annotation
    • http://robfredo.com/userfiles/file/41103334792.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/kubokofoxotaxal.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/pafafujer.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92a5316a8---97521335968.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/99717521432.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/94597453951.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/81522820066.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/52822724754.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb7a63ba3---tulavu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6b688597---duziguzifadepagotan.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/qd5c72sgp3bofk91jmpo9bv3s0/53655951834.pdfIn PDF document text
    • http://954move.com/clients/4890/File/19867603799.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd39e79296---rowoxagejisiv.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/54147375656.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ff3dc80bd---27320708200.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/jufefomedenok.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0b529b62c---supifulibufa.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/366041e076caf5ba3df02fe0f6f8678f/zubizavipan.pdfIn PDF document text
    • http://herve-coiffure.ci/files/17895905407.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0ade59b05fd2675ffb0801778cf94c64/gakajifelevadozig.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/pupf92qukmpbht7rh3q830hcj5/71622144361.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/79299760013.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/94457137932.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116a3fe07680---99214068753.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3107d6ca4cf8ceafb41089e68aa6b3b1/buvoxuguwede.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_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 10856 bytes
SHA-256: 221655f74cab2fb08263546da842b14456d7a5621343c2ea8da0f72ab484cf66
font_01_sfnt_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 16468 bytes
SHA-256: 8c3d474962394a25fdac6438fa146f96109bb05aec69fd1e4fdffc62ffd5c617
font_02_sfnt_off00011d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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