Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e66f9232e226db2…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 17:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68bb5096750c915756529f053a2322c8 SHA-1: 6a4d0557cedf31ebbc3d9a39b04209b40573d493 SHA-256: 3e66f9232e226db223b927eaafb6c426cc2b9f1cf225c6e13ce6c985530e406b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://dzido.pl/userfiles/file/88130134562.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/05d672fa0ba4764a236f149e9a21b8f6/93947362472.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/joxopunetufofi.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/71296843485.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/minuveroni.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/19130780347.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/3898146817.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/94897407132.pdfIn PDF document text
    • https://highrise.pl/file/44411153045.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/82868380411.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/bixodikokarufojotisemim.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/jopirefevunixoj.pdfIn PDF document text
    • https://losungversorger.com/product/file/83219669194.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161369d9b259d5---73320119817.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/rusisogojofe.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/58932489211.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/dilubo.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/gabexarofunosita.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613657f368b07---gabikel.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/jipumevokuxugapavobonabi.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/javurogodosisamovevo.pdfIn PDF document text
    • https://adikkedua.com/contents/files/welipewubawabakofebi.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/24870493364.pdfIn PDF document text
    • http://grotech.in/userfiles/file/48276281065.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e43af53b---melisavomibitoxajapodewi.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/34799466926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+java+games+for+android+mobilePDF 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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 11020 bytes
SHA-256: 8bd3a33b6b49009fd38fecc06d92fabd104ebd1b82059a366b93cb749784c277
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 19436 bytes
SHA-256: 552784e3783cb2f27307432c3c218bf66b02dfe1f6b9dfa28fc8d20eee7785b8
font_02_sfnt_off00013368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1