Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5ab57bf1fc4f7a…

MALICIOUS

PDF

89.5 KB Created: 2021-08-03 14:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8869f35291ab863df02bbde110eb9f7 SHA-1: 33420ec19444ed4175d6c294a2a806f7743e8528 SHA-256: db5ab57bf1fc4f7a33c04ea9a3c2c92831b4ede7a0982f0a39a92a038b401a03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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 http://dolphinegypt.net/userfiles/file/48475715392.pdf In PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/15799749658.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161084e70a42f9---buporixekigowog.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e9362935500---59345715433.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/27802687277.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb9d127053---kazulodudimokegadodun.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/d8qnenjl4akukrhfn8rcpveu22/36045073014.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/91568077944.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a436aa9902d---37530392476.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/nolelofuzor.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/32969412581.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/62458890022.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b738ec4be5b---miridigogaxagozeletobegij.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/zosekaxapukukoge.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070115033073499.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/tikoduxogorobozevo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/dccc84563acc184fcd9d931e363e3c16/9863140113.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/tilopizewib.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/retigotesenodatovigenexo.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/21828538445.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/55920464334.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adce95c97e5---xunif.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/15290325069.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/dosoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=compare+and+contrast+qualitative+and+quantitative+research+methodologies+pdfPDF 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://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_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 11412 bytes
SHA-256: c45c95cff81365de33deee846d8afa53c23171d192536b10ccd2a319f8962883
font_02_sfnt_off00012a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 16348 bytes
SHA-256: 0a05b9ebd380265fe5a706cc94ed49b3e3376d3b6ffed2b13db61798e4283154

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