Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc324371a3322c0f…

MALICIOUS

PDF

116.9 KB Created: 2021-07-13 17:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3e1e78fc6a53c02083ff5f30949f9476 SHA-1: bfea8ee175cf34e2568393f4561d9c3f3c8755c6 SHA-256: bc324371a3322c0fbb2273e48849fec23232a64345dfe8bb3dde6b5a5c1b9efe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft or Super Forms plugins for file uploads. These URLs are likely intended to lead users to malicious content or further stages of an attack. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160830daa829fb---82039720062.pdf In PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075888369f45---norezewaruzeripuxipiweri.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5c79c544c---81341038722.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8749c37248---60712584513.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/bc25758d1fd785c758a40a6cf1126abd/18705915122.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/8tiepahmikoo4jefa40bi0lslu/70697532982.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/fokum.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/48248647928.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6af8474c9---11012670088.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/53278028971.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/kuvitegujexekapodawebi.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/pekusawiziwoxagujena.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/n0oqvsb8tb9jn33nb2n70q8rre/13596293967.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d5a64b07---gijowugisubevi.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b1252860a3cc40fb5bc4e523fade7927/66688056649.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/3224729909.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/zuxedisipoxokanafajo.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/naxumojifibinaxubenij.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/zirasemajeze.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/woxowigudev.pdfIn PDF document text
    • http://landpas.pl/upload/file/meretixosafilokepe.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/s9ou1ch7hggjuii0pdudm2d1m0/93317757860.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8dc01a31cdc87ba49237723228f2a964/wobilazazakuwaxezuf.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/58304251585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=paradise+lost+adam+and+evePDF 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_off00016804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16804 10476 bytes
SHA-256: 44a00a32dbfd169dc56905537dc6d53faf57545c6d7f8208f54fa9177bf38483
font_01_sfnt_off00017fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC4 18128 bytes
SHA-256: 3fe5220007fabf481f3afc84d5c452ae43d2bff31d3f9b4f24b85aff3d58c5c1
font_02_sfnt_off0001ae93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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