Malicious PDF — malware analysis report

Static analysis result for SHA-256 90aabb9933b97235…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 21:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 564ec60f3eff5a426081726b1a253706 SHA-1: 5129689416bb58df5eb4a423c432d6faccb371ec SHA-256: 90aabb9933b972357e5e9ff398a2f0201451610e4baea1357155c6efdccaefbf
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/37d4d355c515405a36ce79a041d3ae6f/tagini.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/94386937943.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/90632327646.pdfIn PDF document text
    • https://akemi.ro/hirek/file/monogote.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/36251957576.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/towaxabemuwe.pdfIn PDF document text
    • http://rapet.hu/files/waxejadawovago.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/92108360660.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3004e6feb---97666898474.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/63371140199.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/19492814040.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607689b40a55a---76511041765.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/xivebegurirexe.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/minunafujer.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/89206772492.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/2094137173.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/de9e0b80a6f7a10746f36375aa86b556/vibiperavatemovaruro.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/57859661035.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adcb68734c---71326560515.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/94109344842.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160820f2351612---91865970481.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/sexitemuxowegulumu.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/2602f0a6e7febf5e6b2312fb288a08e9/pepipuv.pdfIn PDF document text
    • https://digireg.li/upload/33977877864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=solving+ratios+and+proportions+worksheet+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_off0000bf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3C 16048 bytes
SHA-256: b9bcd1764c9531a238d9e1c688aa1cd49667486ff126fe2974a8ddba0b9d74ee
font_01_sfnt_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 11096 bytes
SHA-256: 8eb1a810a90c7f41daee2338faf06e734bbd06f44fcc142ab1ad0720107c8481

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