Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bd28875b6d6e64…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 17:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb029a46f03603a7aecd1416d9da9db2 SHA-1: ef344bd273e689432997f5e1adfd5ab44a2c35f1 SHA-256: 89bd28875b6d6e64da8efe9e5f0d118ca1895f6977050f8f4e232371dba8ec14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Analysis reveals it functions as a link farm, with numerous embedded URLs pointing to external sites. Several of these URLs are hosted on compromised CMS uploads or disposable domains, increasing the likelihood of malicious intent such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://miaousland.fr/ckfinder/userfiles/files/vaxitud.pdf In PDF document text
    • http://5percent-design-action.com/upload/users/files/renabubifukorumer.pdfIn PDF document text
    • http://movediary.com/userfiles/file/fepifofuvobenefodiv.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/15800428806.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/xokawepagulemezuxoxi.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/tigarodotoserujazunupef.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/7771746886136479110f88.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/23538984312.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7pfvu8iq6v8a0nufuqlhk36111/gataseb.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/31752237473.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/gakerazopikijotukoga.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/50911309e4ece88981cdcfc051ec8d0c/ganogi.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/51487738366.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/xiretavigezeloro.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/38417477430.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72235500169.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320ab7391e4---logidudiwatinalano.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/8069807213.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8b2718620eda1cc30cacd5bc8a379cf1/lezaborinepe.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a2012ea5---25187528556.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/de593187a05d5b29970c85ee1c44cd57/kekekefuxelozepipukoveniw.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/73244839208.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6af414800---63076096483.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210904074433.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/28856844740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=que+es+absorbancia+y+transmitancia+pdfPDF 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_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 11148 bytes
SHA-256: 8d5b780ac65dc5494e870f03c566ee48dc9c714cff6150e79e77e774c0db5082
font_01_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 19244 bytes
SHA-256: 545b8630a234e54125497fed6347d108ab69e03452d44a4a24f52cad000098ae
font_02_sfnt_off000129f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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