Malicious PDF — malware analysis report

Static analysis result for SHA-256 484fdfc728e5e71e…

MALICIOUS

PDF

71.7 KB Created: 2021-08-31 21:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: c9ed4dfb8b7f5c831e9a5f4904ca7512 SHA-1: c195a49e11413c8ac912aa809d1b28dd72d25f18 SHA-256: 484fdfc728e5e71e564c9889f4517ddd19de37ab8a264d2099f79fb63e85ab33
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=active+warrants+in+lincoln+county+nc PDF link annotation
    • http://gysanya.com/upload/file/210831130617689541u6rksebndy7h.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/1d7c17655bda0c6fc7b84f40db80fb8b/raxugozizebowaz.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/2768604317.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/aeba3ef7b4ef9456a0155f94270caba5/zikaxuladenipej.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/45480764153.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/58401166447.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/53638074499.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d9c6e2971426cf2e59a0374734a11d26/xenaziwenotejamukekip.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c0b96477c---jelojevasekala.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/kulix.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/65395475713.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c008b554d---19869472104.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/3abc2d966c4ce55e75c57eb5ccf65a54/58576828045.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/47578885009.pdfIn PDF document text
    • https://anfauglir.com/images/file/lakomuxogulowilufiz.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nsfkekajqf1s5b4f75h3t32upd/88215162667.pdfIn PDF document text
    • http://africareview.in/userfiles/file/rojusomurugewonopule.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210726_120950A991625D83.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/778d0ef66309a37abe25ffcd3cf2d295/90175143406.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e6b8b777f---44661154668.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87110a161---28105485638.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fe45d3c18665d694bc3358e0924484a7/pukelasif.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/konevijinafevelazube.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609852b796df2---bumuna.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/d2ee6985d417e0f1b4f27b96afb2ee87/99358945026.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/79610856703.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/5096810373.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_off0000bb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB91 10568 bytes
SHA-256: 5ae39f0d8ec583251cb31ed26bbe6f054160791cc92885069e3bc50c8a934f03
font_01_sfnt_off0000d3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 13792 bytes
SHA-256: 1c00d986262382e5ed276c9eddf35440d3fe3ccbd5861c232947280d9ba41521
font_02_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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