Malicious PDF — malware analysis report

Static analysis result for SHA-256 a964898a18e85735…

MALICIOUS

PDF

72.9 KB Created: 2021-09-27 13:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d4e3f18bcae191c944c5f060c7f84925 SHA-1: e8d861df7c3a7360df9c964cf53d91b0f1e08e93 SHA-256: a964898a18e85735b4eb8cc7a5dba6081234784ffec98535f39bd6d3bb054f70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://nomylo.ru/uplcv?utm_term=naruto+slugfest+free+download PDF link annotation
    • http://ibb-online.ru/f/file/zorixoj.pdfIn PDF document text
    • http://suaups.net/userfiles/file/7815551858.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210921021546492.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/suwunas.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/76133453856.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/nepagurep.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/kunitowijurasikazikoxug.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/roluzegalijifevur.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/72601175291.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/44627313355.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133e890d49e5---logupadotadifazer.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/vupawezeraxobuwotep.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109122306511273.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/76793054470.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/tafuwegorolifenezo.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/bolosenufadojiti.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/zesulote.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161300bb2766f7---zesabarepobolam.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/847b7ecd1772dfc225f691da67081a75/folirekujiped.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec5c43bf31---25054674592.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631368657.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/puziziwegoz.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_off0000b0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A1 21360 bytes
SHA-256: fe672253b6ddb48bd00b44e9c995b8dd7858de53c3e84282ee3bf1b3f6b9db95
font_01_sfnt_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 10600 bytes
SHA-256: 0c96fd5fdafdcb9ff8f81c6cb9d44a764da4b561ffae1845f1ea45d28601718f
font_02_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1