Malicious PDF — malware analysis report

Static analysis result for SHA-256 3805f585cbc9b76b…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 12:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b047f65eeabbf02d6c4b0a319b5c47d0 SHA-1: b8ccb067e171b938376f56e430683bec6a5c0e7c SHA-256: 3805f585cbc9b76b20c64511259f6df603eaf016e724fdb44f710df09683dae1
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code or phishing content. The numerous embedded URLs point to compromised CMS uploads and link farms, suggesting a tactic to distribute malicious payloads or redirect users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 https://crewmak.ru/uplcv?utm_term=project+report+for+mba+finance+topics+pdf PDF link annotation
    • http://janjoling.com/public/ckfinder/userfiles/files/jalerinirumozakusixani.pdfIn PDF document text
    • http://gestioniarmatoriali.it/84764739350.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160935324c73a0---39815581239.pdfIn PDF document text
    • https://ghnservizi.com/file/87080134653.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8fac2ebc2---56349033570.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd65144fd5---bonidejaxabusuwepo.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/82325870981.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/38339762124.pdfIn PDF document text
    • http://cutskytools.com/d/files/fabuwosixoj.pdfIn PDF document text
    • https://tepihtrava.rs//files/dopuvudumugiv.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ejo0akisebrf09hfrn5grnk1ie/lorubaj.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/60344734330.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/bee5a9b484e95f3d0d392d71ca347e25/44922644350.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/97876017688.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/zivitumofebix.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/80547668775.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/bumafegasavowuxapunir.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/37420f944c0a5e1069e0e9bf79af73fc/vuruziwuxugibunufekixagex.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/fevuxabaf.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/damapelamag.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe76012f85---58152840361.pdfIn PDF document text
    • https://citytrafik.nu/images/file/88591990813.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/2hbapdtuf7e41sh5t5qaj50va2/xudiduwuziju.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab137996df---retozig.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/puzenifegap.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/2791706470.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_off0000c021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC021 15336 bytes
SHA-256: 28c5319f5c64067d351d34eecdcf0f5cf4031ba15d80b33e3eec604635b65f82
font_01_sfnt_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 11008 bytes
SHA-256: 4f2c49396f9dbd0fcab8eafaae571f0f76a50d17d08afa25555ed5289fb7d3e2
font_02_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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