Malicious PDF — malware analysis report

Static analysis result for SHA-256 623b642d8fe603eb…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 01:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9dbc99f96c77543d008d13f2a6b0ada1 SHA-1: b959f8212609dc0e2389c825b060d480df1bc380 SHA-256: 623b642d8fe603ebaf6cdedd5934397755b4b4eac5de730be38b775964ef6556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=bianca+del+rio+rolodex+of+hate+watch+online PDF link annotation
    • https://questyme.com/userfiles/file/71173914625.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/6342476546.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/19595650464.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/60496077431.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/60335378397.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/lofifuzerig.pdfIn PDF document text
    • https://asiapharma.la/files/files/jilitidopusijuju.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/1547234645.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/wazexesaguxonorobajak.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f272b2eaf---19857778745.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/30259476534.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/pafedipopoziw.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/4voqsgabl1vtmk6jbtaa5fta69/rejazufexetasifuj.pdfIn PDF document text
    • http://cobmedia.hu/include/83571118675.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/vezosesuwigesixi.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/42754899410.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0bf1c3054c740ed1765d51215b741952/56462912244.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/voletafijeru.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/sazol.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/kibukuxubawus.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/pejole.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6dfad6a9---puripasaz.pdfIn PDF document text
    • http://salespate.com/userfiles/file/73266895207.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/sojosogabekurapiloxe.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_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 17628 bytes
SHA-256: 2861f72b90852d82ba3c304827a73fd608056204b244fd6e4111ec405ea6daa2
font_02_sfnt_off0001228c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 10644 bytes
SHA-256: 664377cb8e6d00736e235a391c17b7f6d7d49b7050684b164506bb2d8d4cd9c4

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