Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5bf6414c388fbb…

MALICIOUS

PDF

85.4 KB Created: 2021-09-20 15:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef4d4677e35b8205a03b823bc3e3e73b SHA-1: a0352735a9cd967ae472b92ae576f8d6532b760a SHA-256: 6f5bf6414c388fbb8fca303667708e57c77a78c6dca65648d3d56f2b06e01774
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nanopena.cz/upload/file/nojipulesoded.pdf In PDF document text
    • https://motiwalainstitutes.org/userfiles/file/55204154967.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/11665197221.pdfIn PDF document text
    • http://blueyee.com/upload/file/141205146376.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/80548778031.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140edf8bb796---23930255640.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/mokowedas.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/44864015890.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/30331596312.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/22082323133.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/noburavukiso.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/kizilida.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/tedere.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16139c4a421abd---maboriraludeb.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/54730664825.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/lezametifumadilerekomuf.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/rasikidew.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/10061611660.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4c373edf---67146750132.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/32335uvtsre1b2bf7dgu63s652/41402627971.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/24382152457.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/85466869528.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/55425814862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+offline+empire+games+for+androidPDF 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_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 16752 bytes
SHA-256: 35a167c4013971f2465f515622ab2fc481c1930d63d88b03785418fae03be566
font_01_sfnt_off0001172e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F45 10892 bytes
SHA-256: 421161d6695cd468c0fe24b7eaaea83a230110af9fb2bb995b01446b284bce3a