Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f7a9fd42b8afcb…

MALICIOUS

PDF

99.2 KB Created: 2021-06-30 23:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bc19e48a708e4319cd29b004e41db5be SHA-1: cbf2e754b190a7bc3083495e2e99e85e91e72e49 SHA-256: b3f7a9fd42b8afcbbfb85b8ce90b72039f4aaa073bc98bf8e71113c35399fb81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

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://drafthe.ru/uplcv?utm_term=fifty+shades+freed+free+streaming PDF link annotation
    • http://drthchowdary.net/userfiles/file/zodonomi.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f26286cdcb4ee73d097d41042467efdd/zugufodudamo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8f803df5ccae097c30dd441b2af4cd64/55760855402.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/5gcmk09onc40kuc2iega41pkvh/xinetali.pdfIn PDF document text
    • https://tangentemag.com/img/file/belijobepewitofizaludobej.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d195a2f95---zowanejifitil.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/tebutogirikinodubawuxapu.pdfIn PDF document text
    • http://haki.vn/uploads/files/sudafokuza.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///73567155398.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/zadujipelirem.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5945cb21a---guselefagisezom.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/56690042246.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988ac09ea6f---buzukaf.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/32408088050.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee441c0408---wipipesatulubexago.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5625f961---64558871257.pdfIn PDF document text
    • https://agenziadiviaggiocagliari.it/file/70060116563.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/jogatiw.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/33afbe1b561265af628ebd6d78e95c09/70916365443.pdfIn PDF document text
    • https://langumeistras.lt/i/File/60132309006.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a5bc2878589eda69008f46f794eb48c7/8022721911.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 10728 bytes
SHA-256: 9dbee98843c500f24ed3e1c7945cce6ed2f870c165ca3fd62bb584552ed184a3
font_01_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 16280 bytes
SHA-256: d7cd55395ca8c5b3ded2e9f44cdcfdf374181edfe397b2f4d7fa01d4c9eac515
font_02_sfnt_off00012c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C59 1784 bytes
SHA-256: e56bba586f25b7bb331306cce9154593ee2e022724dfd3cbe2c17502343e7eeb
font_03_sfnt_off000134ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BA 18408 bytes
SHA-256: f90c903fd2738a8a77a26f1b73f51a228c2e194f78d84712ef0a08658f392660
font_04_sfnt_off000164e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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