Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e70e9b93171271…

MALICIOUS

PDF

72.8 KB Created: 2021-10-10 10:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e124c403560ebfd8f83553eba7c77714 SHA-1: 3cbe4a6488288baac0206e6b4deb4291ecd662d9 SHA-256: 85e70e9b93171271c2be8be616e4327062afaf95ba74923680748ba5a1884c08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=30000+calories+to+kg PDF link annotation
    • http://ledspectrumthai.com/ckfinder/userfiles/files/22338466374.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3vm0h9ugs0bbuhdhb77nb282l6/wupinokimusugumizepud.pdfIn PDF document text
    • https://ratoempat.com/contents/files/12687957437.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/31282663474.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614358b0b5ff8---dazusup.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/59881799878.pdfIn PDF document text
    • https://medius.sk/userfiles/file/92268243078.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/21587144405.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/48283602357.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/44320314218.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/kevemarugitowewatozunepur.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/puzavebofexogevazudizawel.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/33581881338.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/58891319306.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/76258653818.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f021a104e7---vumirineref.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/dezewexamavone.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16330015131214867057.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/58995228224.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/58543222000.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161625f78e0fbf---97104972393.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/80711882023.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_off0000b78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78A 10588 bytes
SHA-256: 5d85f1e88e201b119de5ca24c6836a05badc0c7300d6328d5ea4b45e340cb140
font_01_sfnt_off0000cfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDB 17836 bytes
SHA-256: 8b3a024ead65cff1b4c3a5eac0aacf3aed9b82258e7b97bcb19276fd6b3c2f52
font_02_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1