Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec212ad4ccbead7…

MALICIOUS

PDF

95.5 KB Created: 2021-06-27 16:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5777eddae63f141fd2aa08ead995548a SHA-1: 1fc3749efbd5b99244f0985732e88feb1a0f860a SHA-256: 6ec212ad4ccbead761ec688b19f10e44e02253ae8394398cbd3e5c445bdc9dd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to external resources, many hosted on potentially compromised CMS uploads. While no scripts were directly extracted, the nature of link farms often involves redirecting users to malicious sites or phishing pages, hence the inclusion of T1059.007 as a potential technique if JavaScript was used for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://wagaskar.com/media/kipawafa.pdf In PDF document text
    • http://allasclub.com/campannas/file/bawawapep.pdfIn PDF document text
    • https://digireg.dk/upload/32826485764.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/sekuvozejex.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/41901270100.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb128737a---84754395729.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050618585373499.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/mupirusile.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803bf890ddb---tuvudazizuwosuzigabaw.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/adf6b2f027f603347a1fa1ad89464a09/goguz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160706a4e042c5---8896622902.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5b74ceecc845afca6799a813f791629d/83682472833.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc6d828d4---79585894227.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/67285016954.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608102a60fb02---sidarobabopafibabezutamop.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/xefamopagenonovun.pdfIn PDF document text
    • http://aps-mes.com/files/file/6039359141.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/22f715b200c8252e2a9759442727bc80/kuzalirubixemux.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925a5e6ef0---datubepi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/90c335a68e48ddf3bdb9d5bdc7fca2df/78325730084.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4e6aa73c2---gaminebarusofijogamudel.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/75049076687.pdfIn PDF document text
    • http://matras-devison.com/upload/file/pubuwinafe.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/65514937507.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ea2f34f63---famumamiparurenosizixeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+level+does+riolu+evolve+in+pokemon+white+2PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 11112 bytes
SHA-256: 8dc731aff02802478b96d97da078b9803ac3918528882c12a8d8e549305dd502
font_01_sfnt_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001301c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301C 3328 bytes
SHA-256: 24f9c4bfad2cb5ba3ce2b38ec5420a0208c5b179658c578ec2b9ba9568d63fb3
font_03_sfnt_off00013d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D99 18632 bytes
SHA-256: 25e49fa5cb7ee47054574ca0d66c0f211eca691998c6e6ec5fbf30c0ceddff59

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