Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee4159d4b59e0df…

MALICIOUS

PDF

73.2 KB Created: 2021-08-20 21:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 70a083e6efe2cded3dee153998b83385 SHA-1: acd119304653560c17c345f031c32e2b343bf875 SHA-256: 1ee4159d4b59e0df405c9f9c95be2ff5cdba0a4cf55f13b193831b21af7ea8eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://huntic.ru/uplcv?utm_term=smc+ez+connect+g+802.11g+driver+download PDF link annotation
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8d38f137abd1ccf4ae49cf016ec9fb6f/59667615854.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/raxudupedibiwutere.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/kosikodo.pdfIn PDF document text
    • https://lecachet.fr/docs/files/29663724422.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/81465276696.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/wixejopomarozejigosas.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/tibaxawirujujudug.pdfIn PDF document text
    • https://pecsikult.hu/files/file/mepiri.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/lufowuxatomavupi.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/29go4slkbld1jp3n8k66hq4i2p/51479226987.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/vikutuno.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ruvmv6tr790mjhhab5oo1c2upd/bisanalowamekezixifigog.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/nopibetoner.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9m3cdldfd6m4ugc8luko43hne6/jofokadexesunezu.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/67855722329.pdfIn PDF document text
    • https://strechybenesov.cz/content/jumamize.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/68715508945.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607125592397e---78240581142.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105181608491534.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/dogoxe.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/49980e1b00ef264ef6e6b97ec426db5d/kepizogafidetapitaboxi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160861cc42de82---4208729689.pdfIn PDF document text
    • http://besteva.com/upload/files/41459323717.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/tawirepajigasuze.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ec900de4---29400319053.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_off0000bc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC44 11400 bytes
SHA-256: a3206bbaad55db8b9a64568b5b7be1a5a31b7700f0b1a65eb2dd0be59f6042e7
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 15568 bytes
SHA-256: 63d1ade0619cfb66e2e09919b8c03d881945e1554b20ce9f77edac034b0794a5
font_02_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1