Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81a8c93ab7a35ce…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 22:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a2f9ba9366a6f6a1492dd218e6aa5de SHA-1: 35a96c5e62def79dafab79b13eb1cafa1d1d46be SHA-256: f81a8c93ab7a35ce1156b509507f4f7c00e782b65e987406d577dc3803bca023
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/479ddd8b3a7c9bd4ca68ddffa0558802/tesoxupuwodinodoluf.pdf In PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/wupojugoduxolerowopirebid.pdfIn PDF document text
    • https://ckmandarin.com/uploads/11291545518.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160882091605b6---vujofapolodub.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104d026cc453---84280289452.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/66924518259.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/kitugu.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/77467747403.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/95178722746.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/niwibilekagexovasamipef.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/vodavixejugekodo.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/mosimusovefal.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/raxuwamisotis.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/43114835847.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/15443564837.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/xipiselobobibum.pdfIn PDF document text
    • http://vinmexindia.com/uploads/bazipivulavojamuxuzomot.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/bekizaweretikugaziviwipe.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/388f8811cdf524132c22c0ada0bb730f/40204900529.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kb5dacs46j06ugef18rp2lgg94/87992629326.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/pikorew.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9287773566---lebajepugopugop.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/574ad666d0cbc298646a58968266d4fd/fobapezolitulerulik.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/29059815360.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/85130687422.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1611f5ef9636fd---90325819866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=manual+de+formulas+tecnicas+pdf+descargarPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 20080 bytes
SHA-256: c3e1754a4b803288d4cb4ef0a177fadc1677144c877e65ea0ddeb3b5aaa4e563
font_01_sfnt_off000111c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 11056 bytes
SHA-256: 00152ffcb945b8fc0f71c69c5a2e04a9b9c60e49586e2d2319486e264feacdf4

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