Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c49472e3c475b4…

MALICIOUS

PDF

94.4 KB Created: 2021-09-22 14:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f46e162532521a71cbcc4caffbb0fec4 SHA-1: 6a9f7c80dc1ea58b86ba2c3841b0766486c13b7b SHA-256: 43c49472e3c475b49c9797cc31ea6f8c264e33a19c8b99d2f6c2d2ba21dee715
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1190 Exploit Public-Facing Application

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_MFA_LURE' heuristic suggests the document is designed to harvest credentials or abuse multi-factor authentication by requesting one-time codes. The numerous embedded URLs, many pointing to potentially compromised or disposable hosting, further support a phishing or credential harvesting attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://nebovsem.ru/app/webroot/files/files/82629590755.pdf In PDF document text
    • http://ingenermarket.ru/userfiles/binoze.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/55541829680.pdfIn PDF document text
    • http://mobitransjogja.com/files/9626136641.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/ledivibokatoduduwes.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/93746441833.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/30225275857.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/51633541155.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/fopidiliretivomajamosaz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353afbbcb71---71760198661.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484d6f58215---jonexawujit.pdfIn PDF document text
    • http://efckrakow.pl/userfiles/file/zadobetepopufu.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/71075882437.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/fumidilokup.pdfIn PDF document text
    • http://baoveantam.org/upload/files/82565961967.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61e95e254---24008741634.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cj0v1n74aqfikj0a55plaevn19/xutesusawa.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/54106416321.pdfIn PDF document text
    • http://grossbuch.com/upload/file/42125213376.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/derunesiw.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/fujilokib.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0a650380107a0d3d614a2ebdb98533b7/fubuzafemiropakode.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/petif.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/55838437018.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16148252ce6fe5---sepivebibajuwabinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=view+icloud+email+on+androidPDF 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_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 10420 bytes
SHA-256: 667baab778a329c203c59be5404f843a38b07eee19e7064b1e68bde2c7e2f922
font_01_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 18080 bytes
SHA-256: 847d857059b5a9ccc8e42b680d57fabf69562139236fbe41d8d9e63cfebaa88f
font_02_sfnt_off00015437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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