Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4902d11090f1868…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 07:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dcd2e9f426633deda0c3eed97a85cba8 SHA-1: 1b39e1b8c94457be6db77e7c7bea83124ed6162b SHA-256: a4902d11090f1868295c54a08accdf85c2e30d6a17be4a027fdaae759a5f41b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The high number of external links, many pointing to compromised CMS upload directories or disposable hosting, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://garglob.ru/uplcv?utm_term=synonym+for+the+word+mission PDF link annotation
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3fbb52829931948eb28d7a531e347ae9/dunugonati.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/48130901944.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea683829a---84269290505.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/lojutowibobilikurat.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/luxejeli.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/37593208421.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb7469304a---podogolen.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ade589e749ee301eab1a7ef0ecbbb67d/3298576721.pdfIn PDF document text
    • http://edgecs.net/documents/wafebofikogiretebesasapi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f2d1e7afcd---93344275189.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25d63af6f5---jufijiw.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/wiwemuwebekag.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/72607490630.pdfIn PDF document text
    • https://proia.bg/userfiles/file/tomokubujoziziritameto.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/itingk2j0pc0dn2m817bojj02k/pigogoratekitosisusim.pdfIn PDF document text
    • http://effektfilm.de/files/file/jogapifuxateluwimewikoz.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5vt9hk23d59ha7q73aleu34r8q/ranademezidijevupozugote.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/e59i2pr53i1264rf7jr1702332/65530066367.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d556bdd0b29---68577668374.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/728caffbb4d2d11f085f67ad3791c4b6/49467651176.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/83596357051.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/50027280892.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/99067903995.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_off0000be81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE81 10688 bytes
SHA-256: 3be2a8aed23c4aa7f84d4dbc2b4e64d0d540d044c9fc1f2dd30a68b20ea199d3
font_01_sfnt_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 17088 bytes
SHA-256: 9233fe16204d57e979620b2a5e97a9a4a20181dc0306e9ed14a9245d9be959f0
font_02_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.