Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87d38be8d1822b5…

MALICIOUS

PDF

72.4 KB Created: 2021-09-21 15:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c313bdb7bf7ef1081a2ae1a50ba432ba SHA-1: fb1eb9280cf049934ac36f3c882681e4b2d94356 SHA-256: f87d38be8d1822b5f12599b2ae8793458a7aae4a182ce12359cd1ddb83397192
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the PDF may be part of a multi-stage attack, potentially instructing the user to open a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drafthe.ru/uplcv?utm_term=halo+master+chief+collection+trainer PDF link annotation
    • https://webmenuplus.com/images/file/kidixeguzenenoduvigazutu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613c602b73a75---30871535827.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161398740a6843---88550571092.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/lipegorozotow.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/tomopawukasexes.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/xewixad.pdfIn PDF document text
    • http://eichler-kammerer.de/8843082072.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/davifetun.pdfIn PDF document text
    • https://termoformat.md/img/files/49237332580.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/wafeguxogamelodidewala.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408727b8a13---61031167496.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/42144426195.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ckoa5i99dsq6jt43ok5lnlb2hd/42753318947.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161381a22217c9---74821730678.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/datibisadu.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/vivagabufo.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/lazoraduwuzoxiduwemop.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317201b9aae.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161363da2a59e0---xolitagaraxezalejamedemed.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/mezazapulofovoma.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/towefokometoteju.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/36569061662.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/8000503276.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_off0000b77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77E 10592 bytes
SHA-256: 9dcd01b0dd38743e40167d3da6f14613f216dc3abb6698a27c8e77a8a58a8a65
font_01_sfnt_off0000cf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 17248 bytes
SHA-256: d25c7667aed9698174985522a6f1a044b5f1f29d7d088760c5c49cf8af028340

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