Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a43321ba6304f66…

MALICIOUS

PDF

73.1 KB Created: 2021-09-04 03:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4720e9e5df94777a1319a2b2c863f099 SHA-1: e5ca6cc64fa20c9255e4a0ac7574749b5d27a8a6 SHA-256: 2a43321ba6304f66931727c043e81f009f3d38acbb115f0a5546225590acfe61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host phishing content or further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dbc4d5f035d327179289732ce5c9cbd0/36405420751.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/l2aksvk27a9a0f7gj996d6ao3h/kujuxojidoxuniguj.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/fudegazijexebubonopevofow.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/83e5126a53664e62d4c93b9b3786385b/74709317415.pdfIn PDF document text
    • http://186086.com/upload/files/bedorazezaloterisu.pdfIn PDF document text
    • http://inistor.com/ufiles/files/25939395129.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc74e277e---rodav.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fffc1173c---revidebakarobodesofeju.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073de7ca07f1---68617991045.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/mobenelosubas.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb04a0abe---xuvujum.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/62da5c6f2834d3a44123fa5f67ec7d6d/zilutunek.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/78527344352.pdfIn PDF document text
    • http://rsst77.ru/upload/files/wolimazovumogekegi.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/14606814051.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/27508842944.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/53278519196.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b0e4f33b---leforo.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210517051124.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/145dc1a9383d634c4d542cebd67e0754/97411325389.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/zutugidofowa.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9497a6c242d5976c8fcd9f1810846ee2/roxebonulumiwikogogawipux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=general+information+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_off0000bf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF53 10528 bytes
SHA-256: 770bbf779a4ab927c94cd546686b219d70a33d12594b5d8107e26aae7cd06456
font_01_sfnt_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 15588 bytes
SHA-256: f342a47e50645c1898af7de54402b570728ecc416a32e36df10d73f9817e41c5

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