Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b88b64da78a6ae6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 21:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 611281620ae628c9fa7f9c17d7fdf4b8 SHA-1: f0a6200637c90730a3f9864b6211dcb0c161bd1e SHA-256: 7b88b64da78a6ae6da7fe1d612b22e2d1acc6a085dff383ab0313791590979df
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous unknown URLs, suggesting an attempt to redirect users to malicious content. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://anhopphat.com/uploads/files/toxotefamiza.pdf In PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/7752034773.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/76816302046.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5611dd9884---67820527326.pdfIn PDF document text
    • https://nasikampung.info/contents//files/9156497373.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/369bd69d3f738eef7466b951dd6097c6/83283524878.pdfIn PDF document text
    • https://123natura.com/stockages/files/mobuwino.pdfIn PDF document text
    • https://inncredel.com/uploads/56847688614.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512025107270218.pdfIn PDF document text
    • http://nenorm.com/files/files/penajimifemetumamijikugo.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98853822117.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb34a4b8b---31094218866.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/66372970059.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/54513139676.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf8d07bacc---vigujobalifivitajo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084527f3b1e7---86812380867.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/53502247666.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/22209693108.pdfIn PDF document text
    • http://jar-ted.pl/file/waxedamotoluviruwepi.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/40000153873.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607831ef8c989---jovukojimefokodewugos.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/801d33568582848942b4666e8deaa94b/ruluk.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9b59df575775ae8dbc9fdf235def141a/nazuturedune.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/xamijegapivebifapojo.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/79712849494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+much+does+a+sandwich+baggie+weighPDF 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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 10888 bytes
SHA-256: 0e0eb01bf36e9b032d92ec52df4f88597294d2c8e0a59c20d2f5894e60318611
font_02_sfnt_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 18676 bytes
SHA-256: 67bf2088186d590e2dee19080f7a2469b7ba712e385936d4bca663e5cbfb755f

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