Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f58639d48b0c15…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 04:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c55f7a825799dcd5f7b561a11b621aaa SHA-1: 65b7f57983c98f997ddacfd4f80cac2e27addc50 SHA-256: 77f58639d48b0c154fbad58185062debd356e934669ecff7349a8fa6e9f63fd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS uploads or disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/b4s24b6i35fnrn8tb55a6r8lm6/jimefowejurerokewus.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e9ca8780f6e13e054b8e71cdabeda812/73902027445.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/73941292317.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/07bd0d55c80acf035ef99646c1631d08/46240312293.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/92852333692.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc259a726---tevuwisumopof.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-16/20210516165718376720.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7422afb38312b4b7f50007b4420ba5e8/jarutezatib.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/jofamagopur.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/iuc4ds0kjmq2hgpaehimjckuns/foxisosim.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/jododibajorefizinoxili.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092320c55993---45490897196.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/58627499068.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/xazozapali.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/80749364108.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/66298528597.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/jarugoruwibowawasigekalol.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2018c136e9e834e47758a51900c5522b/95657517406.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/67366019741.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/vivin.pdfIn PDF document text
    • https://subarini.ro/mm/file/voxubitavagedijapadafapal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=qualified+dividends+and+capital+gain+tax+worksheet+tax+computation+worksheetPDF 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_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 11572 bytes
SHA-256: 90fe77d3a3f036c671080c745edb64218a49d112759574b8c5431bdb55be3953
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 18620 bytes
SHA-256: f55117bf8f06ef2ad8e3ec7730c8de4ebf7c58fdc67500a03cc69296014b59b9

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