Malicious PDF — malware analysis report

Static analysis result for SHA-256 8646d6a978ea6f59…

MALICIOUS

PDF

85.9 KB Created: 2021-09-10 14:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed7ec23ced00bf02b94f138cb62bb119 SHA-1: fed5a9dfdcc63ea6ad639121cbf09634d0b7d135 SHA-256: 8646d6a978ea6f5986361fbf0fd168c0f1a5623498d75d8d9b83eb6425137273
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution lures, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://happycolaborativo.com/uploads/files/supavifu.pdf In PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/92085171905.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/tinete.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2daee1189---58814847817.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/zitegelogi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613334ca0494c---88314516123.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/gevexelitinijozobo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2ab21ce1---mozovurinuvonatiloxave.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae35caa41d---vokevali.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/roxezukisoketegiwe.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/15182647190.pdfIn PDF document text
    • https://thepainter.asia/upload/files/368860894.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/85947212473.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/zavefunitojunudogideval.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/41626846586.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/26977647517.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/wevudefonixafag.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e370ead269c05d4c692dcef0519baa32/xexojorerovapixorag.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/fizezelerepumimaxi.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/vofamaxipoxibilu.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/7577175654.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42444641450.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/samowilabakavefumub.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2d49816012805aac6b6cd74bcdadfa29/suxufabeluk.pdfIn PDF document text
    • https://ms01bet.net/contents/files/95038826345.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161340326cabb4---91278285553.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/47912408107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=three+largest+countriesPDF 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_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 18104 bytes
SHA-256: 0cffb3ec6fd269d6fb61f7d06f668a7bd16c5d2fe7748c8499a1116a6d4c7d3e
font_01_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 10572 bytes
SHA-256: cb858483c4c938d18df4da6f54eee41285f2ada2c286f3b02813ff1231d495e8

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