Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90bb472e020aee5…

MALICIOUS

PDF

83.2 KB Created: 2021-10-05 17:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 944ecc4bd7f62c09014787f6e5e58288 SHA-1: 2f2e0d996f0eab18955dba702210d6f87623eae6 SHA-256: f90bb472e020aee517ddc40e31826d0286baf93fae17817763e90d819c24a555
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a significant number of links designed to appear legitimate but hosted on potentially malicious infrastructure. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rfinshaat.az/userfiles/file/1080849440.pdf In PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/poxudevi.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/gabilu.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/92959555042.pdfIn PDF document text
    • http://home-plast.ru/foto/files/lavemukuniremowubijaped.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/fowopulojilawafatedipile.pdfIn PDF document text
    • https://castel.ro/userfiles/file/23712247026.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/46037696709.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614118dc96a60---kajejamitapom.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e70665443---tudijokanifuxuxolilitozuw.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/tizopuju.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/wawusopifitogopiti.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/senemovoj.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0afa1078c7b2f9039daf958476eedc9c/21267516822.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bc13f778f2---vamoxul.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/wuralasowaweti.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109131706405820.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/rikedizatekowakapolid.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/15987523a9fff799dfe12cba970d5b91/42701739165.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146dcc84be08---tesoxireve.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/i2kvgvvhij1h4bj03redp7deco/simamivusinasenepoja.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/51490862160.pdfIn PDF document text
    • https://megalight.lv/uploads/files/lolokifuvobemivotel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manual+scan+freeview+channel+numbersPDF 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_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 19488 bytes
SHA-256: 38e5463a7069df390a7001cf7afad3d195e737723c340cb6effe578be0aaf361
font_02_sfnt_off00012699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12699 10768 bytes
SHA-256: 36c70cb796eeac66d8d54de480af6c7baef0037fd52dead7e527fcb6c77200b8

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