Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb63a279431e8cf…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 08:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c8dd6add5b3649aa82b9ef17e75a05c SHA-1: 86441399f4a203eeb1a934668408eb019bb2ca8e SHA-256: bbb63a279431e8cfec8bd3e43a6b47c0eb0258c52063a0aafad977b1f32ebd1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it's designed to redirect users to malicious sites. The presence of multiple distinct hosts and UTM parameters in the URLs indicates a link farm intended for SEO manipulation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crewmak.ru/uplcv?utm_term=ben+10+ps2+game+download+for+android PDF link annotation
    • https://ivanda-commerce.hr/userfiles/file/bekudavubasanikabib.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/05q2gi2sk7lnfrqrcr0qr6n173/gibuxurepinakovupubikapuw.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/sanubeg.pdfIn PDF document text
    • http://mebco.ru/images/file/45276432282.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/megakoxurunodotopuxo.pdfIn PDF document text
    • https://777mto.com/contents/files/59832163326.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210916_749645418FC0D63F.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/6224131601.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gs816fook63hlam97qb2767jae/paxevevifawiko.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/84482053445.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/44459427091.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/46746739963.pdfIn PDF document text
    • http://midospa.com/upload/files/10760061129.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427dbd171cf---vagebisite.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/penekoxefifiwana.pdfIn PDF document text
    • http://iknow.pl/files/file/98660305529.pdfIn PDF document text
    • https://labelmarket.pl/data/file/wowovikapa.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150d3141b54f---goxigof.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/minero.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/66577026710.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614e28b589621---24367761925.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_off0000ae31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE31 14852 bytes
SHA-256: 07ea719a32ec1933e04a731462d6db94e4f01268cbfdc6d66215b5d76e33795c
font_01_sfnt_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 11176 bytes
SHA-256: b9e3b0daefb14f83ceee5739be8b3bebfbce111b07e0e856e1885e42a30f8c84