Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e9100e2e08a01b…

MALICIOUS

PDF

69.6 KB Created: 2021-09-07 10:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59f2b45381e27b8ba8a6d3592c7e93a1 SHA-1: 839eb87d5bd30242d965af9a6e757e1bb4a2be5c SHA-256: e6e9100e2e08a01b0c2fc1a83d94d705e149493116ecdee549f60ac9d9308e7d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using malicious documents to lead users to malicious sites.

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://aliceinformaticasrl.com/user/pages/powuvifepatetumi.pdf In PDF document text
    • http://goldartline.ua/userfiles/file/76529120160.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/83201787114.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/piloleto.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/zisubomazefikimu.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/51303676644.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/pusinemubaf.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d3beb9cc---18418539921.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/51511384316.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/77105753f72fa2f6b082ed20883ba6eb/guwubaju.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/88232534594.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/23cc0e6c2ee51981fe19a0b79a748acc/27034748996.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923c305b21a---38281169136.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/komepagafomelidipedove.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbcf48ba74---vulafuwalovoluzun.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/lpds4qb4uep6b7kl4l9716hhsc/83137663130.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210618_65A17B4AB962B6F8.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/rokilomol.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e77565e00b5be67e5d2ad5cde918c064/38822555257.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/48613690268.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/iatig6m482ntf1ift70fggnuq5/45842659278.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090602204373499.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/tovujomizun.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/59407949766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=aisi+carbon+steel+grades+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_off0000b262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB262 14812 bytes
SHA-256: 525bd9373009c790931f2b62814db7949c3106cb60c3b2212ff238bd2cdf0465
font_01_sfnt_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 10916 bytes
SHA-256: 2214b343b69eff4a50da2defc7f63d53c81f75c7392f2a4777bef8e60e5ff3bb
font_02_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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