Malicious PDF — malware analysis report

Static analysis result for SHA-256 9754735a8e85a930…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 05:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 372d0cf529d19f936c67c000b1f985a8 SHA-1: 26a1eccf485c69ec3c8621e48f964b0af9866a35 SHA-256: 9754735a8e85a930706b1e750a44ebd6f248155f22c51e8e27a055a4dca66c6a
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, such as http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614487c24d2c8---banejudadomapiritorat.pdf, are likely used to redirect users to malicious sites.

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 http://af.ssla.ru/images/fornews/files/gadizupagazuvaponemofiza.pdf In PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/mozolosuwuwomufevoda.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/cd1ecdf9c2d592ce3d33c289157da5d0/19549483370.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/30623376784.pdfIn PDF document text
    • https://preciseenergygroup.com/media/37397818679.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/jorufejofatazalunom.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/wetuzu.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/zasugopuge.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/suxiweje.pdfIn PDF document text
    • https://network-italia.it/file/51775500784.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/vimizonemazudexedukarit.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7dc27bdf4---18002182741.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/ledomo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138779d039aa---2242358541.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/90134157004.pdfIn PDF document text
    • http://geotersrl.it/file/xupamozotetukagu.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/vomewoje.pdfIn PDF document text
    • http://lex.tj/img/file/kopegabixope.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/delijokatezupaxad.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/32589766729.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/76979922726.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614487c24d2c8---banejudadomapiritorat.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/tutaguxapogedaviwonegaji.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/17943984306146766d95e57.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=vivavideo+lite+downloadPDF 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_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 10092 bytes
SHA-256: ce35f34a1489253a8c300c203242e53199d935ae8d84398645278aac091d720b
font_02_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 17080 bytes
SHA-256: 1db469b4e1b7395836760e745c5bc0973293e296117fabdf3cddbb669b00adda

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