Malicious PDF — malware analysis report

Static analysis result for SHA-256 67538452685493fd…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 21:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21fa3222df6d8d6d5cb981aef89ea03b SHA-1: 22037c5c4a44d9ee3ebb071c04008dc0d77cf9d1 SHA-256: 67538452685493fd7d8e8c24cb70bf0a344eeffa919f41199391fb940ab04ad0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the nature of the embedded URLs and the 'link farm' heuristic point towards a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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://crewmak.ru/uplcv?utm_term=soul+food+catering+menu+pdf PDF link annotation
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jq82rercc6n83q56dp4ft7ef41/32501086193.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/c2dmckdmul864ashfc56jr4c0n/gozavozozuzibilunukoz.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/kubufadarefelikidupune.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd258a86979---rojebibaf.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/tifarepimunerameba.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/58308282816.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5c8b6b3c1cfdc0be837c5b29926616cc/fenoxowokerola.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/juwate.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/83787470775.pdfIn PDF document text
    • http://come2menorca.com/images/file/79275026297.pdfIn PDF document text
    • https://tisuputih.com/contents//files/67963652634.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/lutojofalagigezizo.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/rolevisavinemif.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160810181972ae---88080718722.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/c0kkqss9iqehgla2rfb491nhp6/momop.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/zumobepobolitox.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ee05df2b9092406cc747f4a9556e6ec9/gafetexa.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/61100874468.pdfIn PDF document text
    • http://guiaterrassa.com/fckeditor/editor/filemanager/connectors/phpfile/90958340240.pdfIn PDF document text
    • https://equinox-e.com/upload/files/9359810141.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607954c93bad2---xepezujejikupezenez.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3m86u74lm0ef68ts30fnbag983/25467576469.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/12052548996.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_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 19540 bytes
SHA-256: d0fb2cdbc352ad11dfe9672529ed6d79c6909ed1d7cdb9a1e38ba290bec7a73a
font_01_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 10972 bytes
SHA-256: d033fd3653756e214d062ecb4f666154fa5df5c85689825e31cf96a47d3239f3

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