Malicious PDF — malware analysis report

Static analysis result for SHA-256 d339661890c04eb2…

MALICIOUS

PDF

86.8 KB Created: 2021-08-01 17:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 6580b78f171e64f41034d94e82553f0e SHA-1: ed1999d4df7ec3a94aef9e739102fcf60290bb67 SHA-256: d339661890c04eb27eb825d5cbb75105e35c410da23bfa81282e9bf53108a792
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress sites, suggesting it's used in a link farm or phishing campaign to redirect users to malicious content or download further payloads. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=ielts+reading+test+papers+with+answers+pdf PDF link annotation
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/e6b3c98cb67557e187ce1999fc5a5842/48580547443.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/13496772999.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2881d1e7ae---75801790991.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ba51501b1c2cd2f277567e1e81578b35/zudugujeretorowigezi.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/66052763368.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898615cc57d---9227177091.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef40cbf6b---22606627388.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/56014500896.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2c20fd34a3ce2679b0b7adcc317ef74e/sugurosugi.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06ac9be497---bibokifafavekato.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/ketiwunizotigafired.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/turefer.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dee003293---9378533822.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/5292118638.pdfIn PDF document text
    • http://hevolta.com/upload/file/xanejiwawafugef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad62279536---88708840777.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/wipuv.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/sifapojupujifowaz.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/tuduwegepudetaxogepe.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/70d838a1da1da36f3f7ef9c24d56e153/saxiku.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/29516796596.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3c380c00---fugomiraliralapuruful.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/mmn3c19r4ag3u6nv0aanagp2c4/41156679782.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_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 10692 bytes
SHA-256: 2eca9b9b2df3ea55dd715a2ce54b82b566ff66cb89207964e4931e171d9f5121
font_02_sfnt_off00011f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F11 17536 bytes
SHA-256: 2e7acce6a7a0f7384dcdc5b656635e649e81aaa68667f50b983b1de5084a46e8

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