Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b09de0378e1350…

MALICIOUS

PDF

93.3 KB Created: 2021-08-09 16:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 52f234f57d54f06c89efac61ee258a6b SHA-1: 86fe9e5ea864023d1ee9e3f59b6cf3998337252a SHA-256: a0b09de0378e1350d1753d677cdf0d46c943ab7b2a742f61e7e97a7ea7c8326a
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://worldwidefilipinoalliance.com/uploadedFiles/files/zifixodovirixekajo.pdf In PDF document text
    • http://analogsys.com/uploaded/file/624088185608f26c5cdcde.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3a5347c4d---91661454388.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/tidagujofagibata.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f405998feb9---70765902096.pdfIn PDF document text
    • http://hnspkjx.com/d/files/zizoxopizerizeradejidiwu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094908fb17af---laxojoro.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/6ae222ee21141e8e4dbd3d15ddedbc7d/daroz.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/40852335713.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/zakif.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/tekunirape.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bef7991f4dd---78546510917.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/bebenedawiloge.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/40723679269.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/22973036753.pdfIn PDF document text
    • http://altinay-law.com/images/file/5517183887.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfa0bdc73---66800700735.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/82046244707.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160909c8a9a3b9---94840591747.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/pexofedajifu.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/17050382360.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/keruvezebogexena.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/33551019412.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/71896940652.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/87450335085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+game+resident+evil+4+mod+%28unlimited%29+apk+%2B+data+fullPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e18826d66---putixupe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 17400 bytes
SHA-256: f9d59e70ca48c7a5c6f3e3313adf73caaa3680b8c4bbb57bc206812d56a152db
font_02_sfnt_off000132f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0C 11420 bytes
SHA-256: fcc5b1ab20428f56ea20f155d1bffdf8b3c2e8dd73639f4d077a0c9dcd5ca262