Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dd126fa3cc0eff…

MALICIOUS

PDF

87.5 KB Created: 2021-09-21 07:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cea510f315b8bd0d8feab101faf0ec6b SHA-1: 21b4773bb61463fe8b77f762f679ea61a6a2dec4 SHA-256: 33dd126fa3cc0eff6a72eed03923170faec4e820a1441995a8276fd6ffd64b2c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of a 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may instruct users to open a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=eliminare+sfondo+android PDF link annotation
    • http://immodraft.nrw/images/architekten_agentur_images_/file/53302179522.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161361c3629cfb---41593496788.pdfIn PDF document text
    • http://ladna.pl/user_images/file/tifaw.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613339d722a0d---89357911454.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/64936997273.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f27aaacdcaaf4fb72972f0cfc7aa5934/pufaven.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090801181673499.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/7099679280.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/pajegifuverul.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/87506444708.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/45791333613.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/37440005897.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/58799729144.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/zobotawaseverovog.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/wanerinoloribubozizokavuv.pdfIn PDF document text
    • http://belloverde.net/emailer/file/30504157629.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/kipimiwinodufi.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/53471422176.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/93622439634.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/pisekexomutelodas.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/sebisikuwuxoxisapexunag.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/basomowamumokil.pdfIn PDF document text
    • http://nenorm.com/files/files/vujafamelipomudewu.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/62238555001.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/22117134826.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_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 17952 bytes
SHA-256: b0e29334db004f80775641e79284be10b31b6813d4a1524d34ae333e781cc24d
font_01_sfnt_off00012134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12134 10400 bytes
SHA-256: f5c09bcdeb14e7287eec27aad7d6462213327c89997b2135a58d8c39341b4913
font_02_sfnt_off0001389c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.