Malicious PDF — malware analysis report

Static analysis result for SHA-256 4846a6d71f2718ee…

MALICIOUS

PDF

82.4 KB Created: 2021-08-11 17:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b356b90558953b69f5930964395bd2f SHA-1: 2ae0788c5230cef2454400a4f41697211d31fc53 SHA-256: 4846a6d71f2718ee82c6facfcc310a700f7861b9822e36c5fd5c549ea12c6676
164 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/eedf4cba2e1d7cd9003655c26ab53a2f/33381148355.pdf In PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/419fc6430e824a73a4e668e1f2740c27/vagedagugavewixeziveli.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/supixovulujut.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/muxipugakeborexobebemaxa.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/dabazibaxexawumanobivego.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf45c5088a6---74157178055.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/26242289138.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/bedakufakipitasumerek.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dcfa165df---vaniwenileliguzeronuru.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf4d94232---24439720783.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/308031269218beacc9d5468045e0d8a3/zuzopupabonafugaluzoxare.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e76fdabcff035ff4f1cc25cb5af5a3b6/70204957234.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b8902756---tebipaxalasijuse.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/10048645acbeec8becd21400fd593998/70606090531.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/tepadede.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/lovsm5tv0c1ioird8k0ihfvanu/gibinakamagejikepu.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160e946771a3af---15662309155.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/56623672017.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/83941300933.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8e866c882---vutitiwulopa.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210714_A8CF8CD5F6C3E5B2.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210626194933.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3a69227a---jamozajekukigemibaxebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+an+auditor+contravention+reportPDF 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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 10724 bytes
SHA-256: 9af4c4643390a3ced086929f534384fc3585a316cb9c410be4f4c170b187e1e7
font_01_sfnt_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 17180 bytes
SHA-256: 941c9a84d6a4ed1bd57d4b34f2d9f56df7cea2b353239d3ae76dd515d1c18ab0
font_02_sfnt_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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