Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5550ca907ea095…

MALICIOUS

PDF

80.8 KB Created: 2021-08-20 23:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0cd07335b72457c6581b60fa5621ce6a SHA-1: 68c50678ca89d4b2ee96edf7f696259c5bb04f3c SHA-256: ca5550ca907ea0954c030710b2bee18b1679a7f81d5d1063d03b9a908435752c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate that the PDF acts as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://kiiga.ru/userfiles/file/puligogifofilarufewit.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607077fd12fa2---zarevasiwufaf.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/luwuv.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071bed7368e3---72809637852.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607751a1993e8---94020394383.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/potasi.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/95910894825.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/36313885324.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/19sj1s5rn28rkaip21oaf9h3j1/95306307922.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021629144858.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b760704f90a---97098123122.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7478a3a9fce77984280d97867ef03d29/pafepazoxasigiderivepem.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f50ada81985ca4b6d11feb4b711b7415/66106778820.pdfIn PDF document text
    • http://lawngo.net/fckfiles/jifololigesojuxetepix.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/91333011763.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/78f47564fddd3380faeca1b460a6155f/80649225062.pdfIn PDF document text
    • http://mfahk.com/upload/files/gavogimilojubo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdebdeffda---78431635277.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/74256935054.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ac74ae5bb---jarenol.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076bf59ba2c9---23440551851.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/58218691698.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50440302034.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/vategixedezokava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=when+we+ruled+robin+walker+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_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 16476 bytes
SHA-256: 3e7dddb5959f0c41a94d03adc60f05074a583c304cd93afe0af092044e557577
font_01_sfnt_off0001049b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 10740 bytes
SHA-256: 3cde81bddc9f9552524e6bc308ed1304ed070038ffbf0c8507a092382551becc

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