Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ead59b3bbda7a3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 21:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 051a8e108a523e017e90f8c0e15e750e SHA-1: b775cbb251ee8a7390b9ebb227b9a1621b8d6ab6 SHA-256: e3ead59b3bbda7a38ddb87639b1f51a5b903b1c121748ebcc0e7bf971746154d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=nba+apk+download+2k19 PDF link annotation
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/jegojidiki.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/8039606878.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/nuzujakemerap.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/gopivugevemikera.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152e4f7b2823---37795360435.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acd3315c5a---gusajilut.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5a64d41a6---rurofulukozojibunokara.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/nudovubovatufe.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138518f19077---6421167025.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6206015d---80503821326.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/3714164771.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/90708661565.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/zoxemenexapakaxivelabivu.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/wedinerividozosizilu.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/gapuzuvorex.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/sagefuwatiw.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/99949550686.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/takegawowikujonijunewusaz.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090120240554.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/memegolotuso.pdfIn PDF document text
    • http://dentherapia.hu/files/file/933603149.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_off0000aee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE0 17008 bytes
SHA-256: 2b7af5e448f65f7ac9067ce68103ea77daf5b7e0cdf58ccc79ea51c47b34b1e3
font_01_sfnt_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 10428 bytes
SHA-256: 441aeb021a36e39a1a449dbc564e1852461f0c17910367fcb4a4957128f5f90e
font_02_sfnt_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1