Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8d4a20693ed4c2…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 06:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3172094de87fe811b3aa9d2b5ae731cf SHA-1: fd87eeb5fbf144432718bf4041746d8f015712e1 SHA-256: 3b8d4a20693ed4c247457cffd79a7054e62d519449d007395069ca8bfcfd6e3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=all+i+want+for+christmas+is+you+lady+antebellum PDF link annotation
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/02828afcab45e7d1b54c945d9c80fa2a/zazuvuwulal.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/fotelaf.pdfIn PDF document text
    • http://teresachild.com/upload/files/45096909412.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/gorutilufuduxigibufadurep.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wubapupup.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/l3lh14bg4d45no7ju215tpvre3/sajidaranozavipozafo.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/4875a7d5268217baf02c83f4f95b345b/85655549031.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/95241357974.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/xavutuginefipuvija.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/guxojuvunufenotajugobim.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6955367a86---70787574556.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210508211041.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/tuveferoxasopexilujexu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc14cca0f9---rebokamapeligaminid.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202108080753597551.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/vipaloluxavel.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9082872920.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f077a4d1a6---9834975937.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/179dd0f8228038ccab786185a01a56f4/zavoponaxijodudiwono.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/94818155758.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e66b6a5f3---zijisodudupetiw.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/97675842395.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/nuxalulideranuxinen.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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 21668 bytes
SHA-256: 46c95d211c5e1bebdbaffdbef0e71c4cf5a21d25bd459b1b885f719fed74fc31
font_01_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 11160 bytes
SHA-256: 8bd69f4f433ae472eee9dfa0d8303d733daa9115158f0938c64c98f2a5f974a3
font_02_sfnt_off000131fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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