Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a5df822f317919…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 12:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d69da3b84a5bed1d4ce9b764306e1a7b SHA-1: 5519150e66cc5fe2ea6aca6cbb6f56745196dfdc SHA-256: 86a5df822f31791992c335fd81a01442a209c25578f91ba1c3a37bab109905b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and the compromised CMS upload link further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://medicapoland.pl/uploaded/file/80426312472.pdf In PDF document text
    • https://elemental-ia.com/userfiles/file/65265766832.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd5b8b87b---zijibije.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/kidivemijavekedevudajamud.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/29720019825.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/20247828497.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/nigon.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7fca2723---86667005579.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/94798268278.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/83309351098.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/torudin.pdfIn PDF document text
    • http://airsoft1.ro/files/file/jarinulowigif.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/85353459537.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/jaritolafuluvasarus.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/65459498680.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/55286823592.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/gozawudelo.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/66770365818.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/mejizufozixuxegep.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c5e7c017---34650823979.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161403374192a6---36935807162.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/74680678573.pdfIn PDF document text
    • http://autovoda.ru/upload/files/39247331392.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/genevi.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/96380947545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=code+for+1000+robux+2021PDF 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_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 10344 bytes
SHA-256: 16d822c807a33a583c9148522d3bc853a9202f7dd6817e326bd20e89d5a913fc
font_01_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 18480 bytes
SHA-256: 97dddd017ea1234de522750c6b54691c7f9bac7ab0bc85d7ecb9117190d161a1
font_02_sfnt_off00012d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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