Malicious PDF — malware analysis report

Static analysis result for SHA-256 20adf496817eaf34…

MALICIOUS

PDF

87.4 KB Created: 2021-08-03 16:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef32d87b6d58e86f9ce3b963236c2e6b SHA-1: dafb635495689b8e0e5774cf38429f9198f4e783 SHA-256: 20adf496817eaf34dc499fc75e2061aa20cc5eb585827c66de81b9a7ac279602
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://contabil-fiscal.ro/mm/file/62351741324.pdf In PDF document text
    • http://dolphinegypt.net/userfiles/file/26643860779.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7618a03123efffdbb2832c6dff82c007/5859190751.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/11052879771.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f631a872f4---33932337891.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/gasofadetiwuxexa.pdfIn PDF document text
    • https://andrejc.si/files/file/178058844.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a3a204e9---27623452993.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d3adf912d48ae0833e9c043b02f9fa3e/wazokimux.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606fe101508a4---96807926763.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/52989466862.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e7c4c312---fitudukukiros.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/gexusuxulutezalakokir.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/64650181448.pdfIn PDF document text
    • http://tayles.com/uploaded/57820334109.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/73681556475.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/24958797412.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/19976205177.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/26557459035.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/xawilimijilukol.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1af451a7d8590419b8f9a26297844684/bokumesuw.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe8cd90736---2131910409.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/56228295931.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/gejobil.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/fomaxipuwemarojeg.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4803bc8fb6---24128606499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+reset+maintenance+required+on+2017+can+am+outlanderPDF 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_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 16932 bytes
SHA-256: b67e80fd2f0a3b14ca299de0f88d73b1831a71e7cb3aa7e051d048da8e92fff2
font_02_sfnt_off000132c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C7 11200 bytes
SHA-256: ed7fdf15ea24443c22b01eebbd9a95938f2c962e3ce021cf98322c8786c63eba