Malicious PDF — malware analysis report

Static analysis result for SHA-256 100ccd1850e178b0…

MALICIOUS

PDF

76.5 KB Created: 2021-09-04 00:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bd076e4949d64144c2db136f3ffa2851 SHA-1: 10bd4327c60de2b5dddc1bcc3938687e573d9f2d SHA-256: 100ccd1850e178b08da76e198b077e84be9783b91074a089b71b6c74f8f5e110
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://carlojans.com/cms/file/gidabed.pdf In PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f20c5e40758ba8d65d8d886a779e84c3/40711914743.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/japuzakeli.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/92679601530.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/17970797986.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/lakonetekekik.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/7680090741.pdfIn PDF document text
    • http://teraval.cz/res/file/tanakujik.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/gozeloguzasux.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbde552854---patikodisoxak.pdfIn PDF document text
    • http://absigorta.com/E/file/73095021991.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/52289201571.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cbps0dm2egfrvtup49ke7h6no3/kemoxaxukekonowagidelenub.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/61386178240.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/72181537466.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/palizebubabegudelulufem.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jub5uah67pp5ddl8pqufektk4l/89387571674.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa82aedc82---71082577214.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/567ecce3f484d35c1bc680da074bb13b/lebepufirezuponunijur.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/67192039172.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/saxadekonaxepagi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5r1see08236gi16knbql4do8i5/gaxulevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pharmaceutical+technology+by+lachman+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_off0000c162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC162 18560 bytes
SHA-256: 4fe9d09898222d01442ac5f479622a0e51d30ef15bbd1f7dd9849f5a930e69ff
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 11252 bytes
SHA-256: aee7f0870fb225e96c1cfcf467291f4e1dcf28a2d1f5144625c2927683553d77

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