Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc993e7e75bb626…

MALICIOUS

PDF

83.8 KB Created: 2021-07-19 22:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 569ad2b892a116d217bf6302ee73f02f SHA-1: c5e077b4df7ed9fad4975fb3a7b96a268815f6ce SHA-256: 5bc993e7e75bb626aed71bdffb8bbb96d259de97eea6356412c25df75ae7e09f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload directories. The presence of a 'utm_term' parameter in one of the URLs suggests a phishing or social engineering lure, likely to trick users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://birons.net/wp-content/plugins/super-forms/uploads/php/files/3f0fd4a09fad83c7ce42637099b1d0b3/punebofava.pdf In PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/boruvuziketadisa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/87677426614.pdfIn PDF document text
    • http://accronline.com/userfiles/file/nagazogawugitovilofate.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/xowadugamagubezonuza.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/bgagfmc2383di0lidbiudg1j0t/23046315433.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160db93860fe1a---74093167259.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/zogogufavabasijafip.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/jebenokabujabivemomeba.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/domobobasupuda.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/jezosatafi.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/vivokamutofolijipefa.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070407384673499.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/dixenalux.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4km78noofijfq0pbmpil57cpe0/denugamuzunodot.pdfIn PDF document text
    • https://brakos.it/file/molebojum.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/tazizopasowumukowiv.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e80cd7b455cade5f0697c259e8324636/navikawuke.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/92a5f5971fcaa37f4f959e3b91324523/3514817934.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090fddd4bbfc---60485149239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=convert+pdf+to+pages+on+macbookPDF 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_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 17128 bytes
SHA-256: 9727a6d4f45dece7987c0a837c483ac3e9cbc8f8f0d84ca4292ddb38192c26be
font_01_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A4 11152 bytes
SHA-256: 6d39842f85d1d7bdc008da720045034010be2efa20a25841050ae9c48d9ad5b1

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