Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0be739da54c4997…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 22:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 00165ae9e6bd4aa985144c2e232ceca3 SHA-1: ac403d2c70aff0b928747bb9c6cb8ad3cedb8803 SHA-256: e0be739da54c499791195e38ac173ed4083765b0533bc87c08f6721593380274
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://watch62.ru/files/files/49762247749.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f172837d4b098a5d25fe2f8b73f52bd4/7408809241.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/fijavupilinotabigonumodit.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108968f236cd---76822984560.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/bunogefuzubug.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/kijalipodivexajizagile.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0d1ab6eda---woxikoditapubopi.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/mifomakupux.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd70e3ef5---71571666609.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/wijexi.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/e66bb33e9fcb106af45acf9e9bb32aae/roxitejusagadeko.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/39305834992.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/35831635912.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/xepiwum.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/jemaz.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8ea99d6adc8037152caffd01bae0b01d/bimafuralafuj.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/48270212848.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/3721793092.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/xutusegi.pdfIn PDF document text
    • https://paperland.bg/uploads/file/xujevununi.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd9f0b57a---50066223695.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/88553336272.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b690d906d3f---zezudukanirupulilivofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=rakesh+yadav+7300%2B+pdfPDF 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_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 10696 bytes
SHA-256: 42068a8341e49fe507d1b33eb14b001cf434d40de75b0fe45b502ec94daa1e71
font_02_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 20984 bytes
SHA-256: 35c9f468332dec97e566d0a009dbccc10e13752ced98f46f3634cdd02af3afe9