Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d6e27aa095a500…

MALICIOUS

PDF

90.2 KB Created: 2021-07-04 22:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 91c67613923820dc1a21673d3667798f SHA-1: 01f1d8dbe3a429b248d8d1c2c6bec988ee9c7455 SHA-256: e7d6e27aa095a500813eae9e1a3a9fb274ec7fdedd59b8ecae0873eca1c5517b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users through a seemingly legitimate document to these compromised sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abade34ebbc---mapiwomunataj.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f9e958376187597d03ff1fb7ff275137/vofabuvub.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/kijusezarul.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/6800fdbd2d571561e3e80c80d7d8f5c2/17939963890.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/78184297523.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/kitolagumemawexamew.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/nevef.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/053922754fec0207455213e471cca354/bamageme.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23532acdbd---79109925047.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/57531349579.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/69951359483.pdfIn PDF document text
    • http://dzbnf.com/upload/file///75899021847.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/66721860113.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/76867065109.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/diritovulonivune.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d0e50b12d9b255dc87683cbca19aae4d/25180518602.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091c971b19c0---12361689411.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ae4e21150---zudiw.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607234b3cef09---nixulam.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/6634c06a65e6d749528d14bd90f92c6f/berovebe.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/wujob.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095c967f11d3---70070197366.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5c7b54b40---72406993309.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/vugixogesit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fathers+day+20202PDF 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_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 17152 bytes
SHA-256: 7eb5392a3756883d90a754dcc9cb74bcacf696660fb024c4b709bab5060b2554
font_01_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 10316 bytes
SHA-256: bb7a9c02f1913f5087c77a27ec07292be43ef84654d47d1e8cbf9834291e781c
font_02_sfnt_off000143ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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