Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff8b9ab4749e279…

MALICIOUS

PDF

69.7 KB Created: 2021-09-06 04:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 461d834bb964e02ada032f739efbae15 SHA-1: 80283fd099979f62b87f69ea77fdf4d0dd929397 SHA-256: bff8b9ab4749e2793d1dd806c43390fda3039d8b500aacb483fa7f630004b8f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting, likely to distribute further malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://dorapeyzaj.com/userfiles/file/vuruzu.pdf In PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210608/file/16231478153910.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cb9413c78---xafimedesojibu.pdfIn PDF document text
    • http://wwstationery.com/files/file/76678681946.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ade56a7be3e---fevesapopopegowimedu.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/91568029585.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3919c7e7---58833494265.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726b1a7e25c---josukalajula.pdfIn PDF document text
    • http://stromzeleny.cz/file/61437792812.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4a6318b278f04221c88a8ab19416de24/gozojinijadibokifazifade.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/37d6cb65c225f9e2787cafb0ed269caa/lakol.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161179f51b6007---dadumelopisegiraketem.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/971a518124349d62cb4d3a54792d1bff/mefisinebu.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/rotesepejesesu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24da674f86---pujodonovakokurotevilif.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e44f9dc40a0---sokizetosemodaxem.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/kibenefix.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/bogobuwegivutubebitu.pdfIn PDF document text
    • http://woykoff.hu/upload/file/jotorolumunerevovovugopu.pdfIn PDF document text
    • https://iword.de/userfiles/file/64720476417.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/fcn7n1udckmfkpocec65tt343i/50447377350.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1628562472.pdfIn PDF document text
    • https://gozdemsigorta.com/hulya/upload/files/94358763973.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996d37d3b91---didafoguregogerivew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bangla+book+pdf+file+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B6 15612 bytes
SHA-256: 520bd29b37b526868f31920bd34bdb3d0e445cf95d295e8cdd467068d3e2ab4e
font_02_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 10680 bytes
SHA-256: ac5d2d456b7855e90b726ea167fb2c0fa031a2a8fceb254fbe98121edb4bd3ba

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