Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ceb99828416ba8…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 04:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ddcde3c0564feb71e1566eab5608ca1 SHA-1: f375543007c23ff85bb035d560d3b28a0382cd08 SHA-256: 49ceb99828416ba8be40fcf2639d44d2561270ce216c3429ecfa1064fd2dba58
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The primary attack pattern involves luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://vrajacreation.com/uploaded_files/userfiles/files/voxuvesobavorowo.pdf In PDF document text
    • http://sxhk365.com/uploads/file///2060120886.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/92353555036.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/votoxuzurokamexif.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/10506203418.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c84f1bd9---67421638136.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/58281770743.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/84665273662.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210827201723.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc4a4d105---zolowubuvopugezovafexowog.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b240ca62e5---13309813771.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/77585072459.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/de5411c7c501d2943d5842c8161ad8af/11436460133.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717c2f38f8b---51544005371.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e94680bf---9191468869.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/33483506393.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6a9aa110cbb9eff18e01698d58eb7e37/fiwumixusiwedeluganilide.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/vitupisajijeg.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/difezisimedoboserugizi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/81326228025.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/62081485435.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/taveremafakorosemewubum.pdfIn PDF document text
    • https://digireg.com/upload/8846222755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bauer+utilus+compressor+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 20276 bytes
SHA-256: 126890c1ab6f24b707cbd36b4d960b42c9713e7da13c9eb6e13db9845592de2d
font_01_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 10688 bytes
SHA-256: 7730e2b12feb50f875d490212fbd14d994d9b9c8443a3a563d1706d224854f5f
font_03_sfnt_off00012c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C78 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4