Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf993ba4f786630…

MALICIOUS

PDF

87.0 KB Created: 2021-09-11 23:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8bffae7f0d23439835f5e6c077a170c8 SHA-1: 5a4844d2b06d672d52ac3644ee1e416772b1c326 SHA-256: 1cf993ba4f786630877af898b99e8c308c96f0ca9a186d5d20d7eccba689ea73
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple external URIs, indicating it is designed to download and execute a second-stage payload. The 'Clipboard command execution lure' heuristic suggests the document instructs the user to copy and paste commands into a shell, a common technique for initiating malware execution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=football+chairman+pro+apk PDF link annotation
    • http://tfe-design.dk/userfiles/file/12798611509.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16138addf4b3e3---72818720790.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/pimuxita.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c68f1b3005e1b126464bf318e6c52eb5/60109813886.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/raruzetamoworonetaziz.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/49326184832.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/42832234301.pdfIn PDF document text
    • https://loyd.rs/images/file/43656575456.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/kitozegujidaz.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/40036029144.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/mirunejemaviv.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda9731f1f---63768837739.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/nekowupamazefaxiwasut.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/54739975590.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391c1808f30---75414267473.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xogonu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613329709aace---23555196568.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/76203779325.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/zirokemodigipave.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/sukolumum.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/45095829155.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d20bb5cbc---355586649.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/numimakefosiratomewi.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/9239334495.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 10548 bytes
SHA-256: aab8e0c2f230f979504ea5fb86910a07c75383fa8d1daf332c4a46f15c60bde2
font_01_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 21856 bytes
SHA-256: fa37b2cfb40e501576f320014bfa71ddfa16d0bd3309d413717e87ea4b93a4a9
font_02_sfnt_off00013607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1