Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac3c584f9935b2c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-03 01:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00c0139eb7adbe6142fb07f2e310e649 SHA-1: 8adfb353a436f37f4b6be0df3fbeb96641a8b212 SHA-256: 4ac3c584f9935b2c4bd6e3e349de43356e726e59d67f7c666eb10116f91797da
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress uploads and other potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/88e18c38825028c4342211319b7c0e89/12238705639.pdf In PDF document text
    • https://k-newsletter.com/ckupload/files/56810207058.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e21d03a325---46218048852.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/duwosuwizixiweponor.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fd8d533697ba2b4e32e2836ce7d17b5e/49192689911.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/28095986897.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608a96f75d307---lotivogepudilixakufizezav.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/mulojepebawivaxon.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718c3217ba9---debamajo.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/53555703335.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/wibixoxuw.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d29a30e56---xanotikusab.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c92fd5bc85b---kedukatitidajesodubuniza.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/14578959540.pdfIn PDF document text
    • https://coevent.ru/upload/files/57343114883.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/93431647586.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/45191159179.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8u7mrib0k1a6koj5bfncoffep1/34540339232.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/67989316316.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e9350ab8a---71947628952.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/5809753199.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/xudosedumatedupare.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/mosategoziruba.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111c7d313346---44248158818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tratamiento+quirurgico+de+la+enfermedad+de+parkinson+pdfPDF 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_off0000c4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D8 16476 bytes
SHA-256: 3fab34ec79628f6fa2f839c6026c0496e22ef5f7fc829de7070e24292e4e288c
font_01_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 11264 bytes
SHA-256: 6160f3866c59076da549708c1ae4127034388b65de61d7d949a1e01b3e89dda9

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