Malicious PDF — malware analysis report

Static analysis result for SHA-256 110bdfc3e7ffd02f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 10:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cad0219d37dd5b041c472a7f2bca6506 SHA-1: 002241da4da27cfc121ed60d5390de859e57c919 SHA-256: 110bdfc3e7ffd02f1314556813b1e2ec5cb3cae518ccf0a4ca54542b197f847e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting domains. This behavior is characteristic of a link farm used to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://laborke.ru/uplcv?utm_term=how+to+use+an+android+tablet+as+a+second+monitor PDF link annotation
    • https://akconta.com/uploads/files/38250242292.pdfIn PDF document text
    • http://rnralpha.cz/res/file/93826713664.pdfIn PDF document text
    • http://cbstav.cz/file/telewuvegagome.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6bace6b2068d30f46c563512b7fef05f/kopofena.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ed766783fcc08d7ca61e97f3bb7f25c9/9978500995.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/b4lvo4m8s85irb8n7kg1niiqaq/jipowadep.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/bogofunibafibexulawunuku.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/97340955334.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/64239201440.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/momobazuvebujoma.pdfIn PDF document text
    • http://sun-eko.eu/files/file/namavo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6c77aa0a3a99c14f009b118aba7473e2/pobixobutemakis.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/wulajubufoxetufirojimokap.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/miwiruli.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/7535083250.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d7e3342f---37693573677.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210913014416_cm5kib.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109080950415238.pdfIn PDF document text
    • https://tonitomov.com/picture/file/wovinatinuselekino.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tevipubovubakawu.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e129d97e---tomevodomizakujilokaned.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/13533769931.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/86024089837.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/kikepisadakubowego.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/63546906190.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_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 18372 bytes
SHA-256: ba9c415448b95e8be6ba1ee63d0a52391d2fd446c70295e50acc337d4bf5eb07
font_02_sfnt_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 10848 bytes
SHA-256: 333c1993fe844862a25eb2bbf6a1bf2d60bfe30e8fcbe8c02543302f57fe072d

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