Malicious PDF — malware analysis report

Static analysis result for SHA-256 b106e3f1c0544bd9…

MALICIOUS

PDF

70.4 KB Created: 2021-09-07 04:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4da811e873a323741ffee6a3d923c178 SHA-1: a2a98459384b0c2499602c61523aaeec2a4de7b9 SHA-256: b106e3f1c0544bd90252edcd477d22fdce57de56190869a789dec8b7b5693ce6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, including those hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=consecuencias+del+pragmatismo+rorty+pdf PDF link annotation
    • http://ei-windykacja.pl/upload/file/tijowan.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103a4504450b---zazujugerozuwagaxababij.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9425d56567---mitixabe.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/55420179698.pdfIn PDF document text
    • http://korytnica.net/data/files/2190202831.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/35261102600.pdfIn PDF document text
    • http://rentaruedas.com/files/others/26779841560.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/lulapodigopobireturagime.pdfIn PDF document text
    • https://primer-spb.ru/files/files/42750145545.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/fivepativilaronuda.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/lugefudabexebab.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429050220137297.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804c41f236d---zepiwifutavuzeranugota.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608394d77cc28---xuvowe.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082df41f0353---wofumaloravudov.pdfIn PDF document text
    • http://hexindechem.com/upload/files/gizibagidirud.pdfIn PDF document text
    • http://maxbrio.kr/files/files/xixoxevowu.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/12976186982.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b770f6d057---tezunudanar.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/89515563676.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/pubewizonedot.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/647157864.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/piruriwuri.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/ff547ed20eda0ab71cd402c972ff6172/pugatusaweboketigivirumi.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_off0000b414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB414 11208 bytes
SHA-256: a2a13bc06d81fa54a40c28cece29792ee249644d7ee276bafdfc77a7eb898542
font_01_sfnt_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 14808 bytes
SHA-256: a14207b194e619e994ae9e227c37a69122a50d78b7722cdc9754f60f52ef9f91

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