Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edb95cd756b0f7c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 09:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6fe9d9d599bbb3e41648c1e3037f6819 SHA-1: 2ff9fef98981de61155f918d35e43541d5295944 SHA-256: 8edb95cd756b0f7ca256f5a1cc03d65e451a175d166f727050f68920ecaf5e26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links pointing to compromised WordPress upload directories and disposable hosting suggests a phishing or malware distribution campaign. The ML classifier also assigned a high probability of maliciousness. While no scripts were explicitly extracted, the overall structure and URL patterns indicate an attempt to trick users into downloading a payload, likely via a deceptive download button.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=bd+singh+genetics+pdf PDF link annotation
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f79a7b4c91---33265024905.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210628014827_njh8ry.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/rifuwesu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3kvd931bb7pq3rbueu33c7qbn5/92016503663.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/39165302331.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa5912ab8---jexutusunisomasev.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///tuxovejupamozorubewida.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/miwomomoxowemogivida.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01f60148f5---jibowuxaj.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/jigaminofoxone.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7bf57320ea9dd72524de587d43ad93e1/zifovupawutuzoliw.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/47587324736.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/9520113937.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c819ad4800---pikakuxida.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/uq0lou7osnt85tgnrktmlbpjh5/96871561569.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/rupokenivik.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/85b7f7b76c53a600e452783a7a2d95b3/vewefakugesusimax.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc44134585---wepozopalefetuvobusi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160873f257f293---92439807079.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/risawanux.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/c390bb69fb14acd7ce1c2f7e78ec5d18/zaxugosiredilozomadajutiv.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/dae22a732869f4e9b6d2cf5e23d95417/muxezasumijepiraso.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_off0000d38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38A 17932 bytes
SHA-256: 2ea2d1aa78f571a76a21b54391e7d52bd462ba70bc1cdffb208e91416f6b9522
font_01_sfnt_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 10524 bytes
SHA-256: cccae0fdf0902ec2272b70220786f48eea4bc11ba28f0259409f6fdaf400ef4e
font_02_sfnt_off000119eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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