Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab04068fc746d28f…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 16:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a6a720eaf882964ad27d80e6f93d13cf SHA-1: ca41bd3b7b642438f978661f04d9d73a68ed597d SHA-256: ab04068fc746d28f3f46322fc15f034abe6f55898a44491ec3d39844ae535274
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • 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 https://medvor.ru/uplcv?utm_term=rugby+nations+18+mod+apk+unlimited+money PDF link annotation
    • https://tktravelkorea.com/FileData/ckfinder/files/20210905_281BC57D3BAC0951.pdfIn PDF document text
    • http://preiss.at/upload_files/files/vapumuwala.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/konuxasowitatoj.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/wilopofeleguxuwal.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0eeb0c48---disodafakukibumidupuzus.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/xixufapijir.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/watunawo.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/10245255384.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/865828685742585ad3d9b5fab7365a06/fewunoxifekinefot.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091304210373499.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/33645776731.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/3428565326.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/99454401004.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c62ac29e04---82603854137.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/59476792169.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/vomoveneku.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rk6pu28b8gc76esa5dv7clnucv/jepimojawowapija.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/botomija.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/lologutabubupenow.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/64914508500.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/46092225281.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/2660891759.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/76957163373.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb5b7ae225---61401875939.pdfIn PDF document text
    • 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_off0000af8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8A 14836 bytes
SHA-256: 2ac88ebb91471ee9e6e0b75a81129804fe59f991da9fd6dcea82cc8e6a2720f8
font_01_sfnt_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 11384 bytes
SHA-256: 89663655bba040f520dd2c60327c8ed95df30fc1274070b12e24d32f0b4feb1e
font_02_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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