Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c97ef90eef98719…

MALICIOUS

PDF

107.2 KB Created: 2021-09-07 13:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb42344c028524104f65b71e01f93478 SHA-1: fe10a89b8ccb92a791512d28021a6aa44efe3e20 SHA-256: 6c97ef90eef98719e54d78649948300b8debf82a61d8934852b72ab7af1bfab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://catamma.ru/uplcv?utm_term=citroen+c4+2009+manual PDF link annotation
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c078459745---57053985155.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d61314c50f---46355248481.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/nepigometaseb.pdfIn PDF document text
    • http://cocoal.com/uploads/file/13262799305.pdfIn PDF document text
    • http://fullx.net/files/33614910199.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a21cdaae50d0120cc12885e18b877b88/mowugovejewikukagiresa.pdfIn PDF document text
    • http://bakoca.hu/files/file/jofogipezidobipoveniwuma.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b3ab654baec582297e071afab31420c0/92750414988.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/2f246ed51325637690c877efc49ac0f8/84289612434.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202108161751063041.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a778767ff42---rusozo.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/duxovilepo.pdfIn PDF document text
    • https://fong-cai.com/upload/files/kinuvavomogavad.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2f0690951a8cf57f3b4c1b8e84576d5a/filaranitiv.pdfIn PDF document text
    • https://tonitomov.com/picture/file/47961511338.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/20429510097.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c1dd12cfe---fumubowaropadasage.pdfIn PDF document text
    • https://shibbirs.com/media/files/duvif.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509224356433.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4213c603184e576f1214444a8c9b8b2d/88295081565.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/50990860432.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/vetazamizetotonozaxike.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/pafigebawalelaribajudubi.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d62c2352d429ed515f38810d7ce3ea30/36385970337.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160edca049561a---xudizadufevojido.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_off00013a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15222 10844 bytes
SHA-256: 10146498d9e4673f644ab108d55aa6a3679143d9f51ead19afdc3d9ed1866c49
font_02_sfnt_off00016b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B3F 19864 bytes
SHA-256: 69cf68e0aef031ad5db30de9ec3c2221f7cb29ca4677daa979ae1024fecfe3c3

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