Malicious PDF — malware analysis report

Static analysis result for SHA-256 473396bdce14f481…

MALICIOUS

PDF

79.8 KB Created: 2021-06-28 01:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b88dfec791530e26fdab1612de3415c SHA-1: 5c0c500e2baf9cc4a2ab0676ecd78fe01d37160f SHA-256: 473396bdce14f481aa79b9ee706beb052d22106e3f19f822768cee58f047aa7a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users to external sites, potentially exploiting vulnerabilities or delivering further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=how+many+worksheets+are+there+in+one+workbook
    • https://smartcirclegroup.com/userfiles/file/pazuvukuzedebu.pdf
    • http://anaminfo.com/attachfile/file/pebokokaxisus.pdf
    • http://aarogyamedico.com/userfiles/file/24542206337.pdf
    • http://amexeuro.com/an3_Uploads/file/peziwokefiw.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/42fa83e20895cb8838f042ce541d93a9/42591510511.pdf
    • https://ahreco.com/uploads/news_file/jujixazegokofej.pdf
    • https://edbcagliari.it/file/sugubakazifowus.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/wotodefofujimirikoxir.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7a719bb05---putaravuwigana.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0861e807ae7ea6713310cd819fdc029d/78900231483.pdf
    • http://candientushinko.com/images/file/sovonutidobopupa.pdf
    • http://elitaliaweb.it/upload/file/83849273235.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/44f17ef625a8ce2aed80050e48c1400f/fasilabal.pdf
    • http://czdashan.cn/uploadfile/file/2021062303181873499.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/90529808866.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/27704d5ce84858e76c46a12b875922b5/xugunibonoz.pdf
    • http://gourmethousemacau.com/UploadFilesfile///41330328451.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080468421711---begadaxe.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160887e0281303---woseguv.pdf
    • http://atek-ent.com/upload/file/vogoratijevexi.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c6275e436923b165aa61075d537651d4/6620989801.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc91764a4---kavukudavogobirop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d658.bin
7e7709828a5a69dfcb5aac0ac8ba2bf771b553aa9a6718e61109d156a2cc69c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 10748 bytes
font_01_sfnt_off0000eee6.bin
3f2651dccd93f1da9acaa73ca26d61d55788e05bedd33c59c67aa3307b9e992d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 16556 bytes
font_02_sfnt_off000119ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 16792 bytes