Malicious PDF — malware analysis report

Static analysis result for SHA-256 9435b73fd8c057e0…

MALICIOUS

PDF

92.9 KB Created: 2021-09-14 02:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 19e6258b59bd4d7b26f26cd1f9a67086 SHA-1: 218422fb6454b99fafc34d5d7d8b89286e6d27b4 SHA-256: 9435b73fd8c057e0a3200fbda696088cbf92e02b3db32ee5da46ae88a89a9c1e
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 0.9866

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://video-cycling.de/files/file/fugur.pdf In PDF document text
    • http://soupworld.de/upload/file/59451146787.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/kekojaxunejebo.pdfIn PDF document text
    • http://sun-tes.ru/files/file/xotozutu.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/sovexipawaf.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/tazazekiduniga.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/sujekatis.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/26397848319.pdfIn PDF document text
    • http://juentai.com/userfiles/files/nodasirepapitimuvawe.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/webuxevem.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/8679537813.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/ziwigijojagutebogiboke.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349605e93f2---xewojesiziwelulunono.pdfIn PDF document text
    • https://rosycaffe.com/file/lulisojutikizezape.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/tatuxudirolaxefokewedi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d89b5e48282d54cf87d0af217cb3d8be/96811356103.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/5286351871.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/pikewugi.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/50145964501.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/74732923874.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/146e48908e495b92f50c3079a41ddf32/jugar.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/85580572804.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/40625279876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=game+chien+thuat+cho+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 16420 bytes
SHA-256: 98f88d30f9c6e3495bb34fa538e3a9ae54e60c0645db410f90834869c3a25a10
font_01_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 24696 bytes
SHA-256: bdb4dadb06b21062df2097c4acd8c51c2aa2a263be5a3a558edd5c6ce1be09c1
font_02_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 10560 bytes
SHA-256: 2384e6944fb31f154b3c69e6c03a71f9b8a15c451c2f91b4b0d8eea884cc96fe
font_03_sfnt_off0001441e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441E 2032 bytes
SHA-256: c792d173675150f70763584c90644340936b7d4cb682afbb94154733b25266d8
font_04_sfnt_off00014d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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