Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7b058d4a7eee8e…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 00:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4be85e988bac5f19755ffce494ac4927 SHA-1: c5e2155972ebc579a1151c55839b824163f7af95 SHA-256: 2f7b058d4a7eee8eefc73b0e9a38681f78f951475d8753805bcac8ebbfb1a42f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates links to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://www.savininkai.lt/ckfinder/userfiles/files/63337420422.pdf In PDF document text
    • http://vdavloeren.be/userfiles/files/vosolaxezilatanadizaji.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/xopopebafebobizubixo.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/8304232285.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/10515992555.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/xaruwojumumabujad.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9da4847cc---48976083682.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/samazepen.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/talito.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/4234916704.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/weradabinibewijiwisom.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/wowovivuzu.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/87857579626.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/xuzubiwokexorexisive.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/70147080386.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ed2098e104560869f09e790fa38c6f6f/45295393701.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210904_041332.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/vikef.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1630d0a49---sunukuxodese.pdfIn PDF document text
    • http://kahasat.cz/data/file/getinediguvafebepero.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/27918773761.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/mumusezararuneju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=office+essentials+loginPDF 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_off0000be6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6A 17652 bytes
SHA-256: 47dbafeb58268f4f6d1f15a1659e107046a3e0ae933690b7e83e4ea8abbd6ac0
font_01_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 10436 bytes
SHA-256: 9c6e37b61668a5cd90cbf9857c4353e27c82a66ecf57f957a230392fa4acc5b6