Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd755c699ebb7a0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 05:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 64faf7b509dc7b5bd79bd6a8d7a7aeae SHA-1: c3961df0bf25524b9f788c8293864b8c5ceb3ca4 SHA-256: 2dd755c699ebb7a0a6dbf2df9a4573eb8e8c3cdb0d224935cf201959c1be3cd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on potentially compromised or disposable domains. The primary goal appears to be directing users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://thuanxuongmonmb.com/admin/webroot/upload/image/files/sidelepobi.pdf In PDF document text
    • https://techielingo.com/fck_uploads/files/vevori.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b9f40a53b07f600ea2c39cc571f178d3/kutebuse.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/84770847213.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/javosirud.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/dusuruv.pdfIn PDF document text
    • https://tch.lu/files/files/18359809692.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/tomatolexamuxusixelewo.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/52405081546.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/9341593765.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/96471046747.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f03ce5099---97156480428.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/riwazodasavizipivos.pdfIn PDF document text
    • https://breedlife.com/upload/files/rudajiguze.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/rojenonugivug.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/munovup.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/70199267497.pdfIn PDF document text
    • http://newcityhk.com/userfiles/bixogotuvuwigibilokov.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/bavad.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/lerugiguremenonap.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0809395c2---nisigojazosepimavatawev.pdfIn PDF document text
    • https://csn-alliance.com/data/files/98924164886.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/somafezuxomifebazutisem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=biugo+pro+apk+downloadPDF 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_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 18180 bytes
SHA-256: 6c3b0a6c3fea8ad6dcf34742adc9191f3841ffae4bab03c555afc10a0acb6c9f
font_01_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 10500 bytes
SHA-256: 527601f0caed60e749d6d3bf102727dd4b67e791d9a2f09d43be5ad628296ac5
font_02_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1