Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad0e761cc2f1e57…

MALICIOUS

PDF

68.1 KB Created: 2021-08-30 03:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9cf277c227db4b4727f9ac305f11b16c SHA-1: b0791c27f564fe0d5e5d1ff33dc8de91cbbbb674 SHA-256: 9ad0e761cc2f1e573059af2099ac06863816ae0ed8cef2c8129463f071fc5e3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://www.prodomasa.com/ckfinder/userfiles/files/12791300651.pdf In PDF document text
    • http://thietbixanh.net/uploads/files/wobedogageweza.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/lutalumapaduxowejifupaxa.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/9095445805.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/nuoaarpao8osc6543kivjej59b/xagopekusejubizoxaxizeso.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/98894565778.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/tipuvuvagi.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/21644122198.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/17999217790.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/xedelir.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/rk2r45khqsv5nq42jkvv2js005/44556263407.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0973f326---wixesukilepezekiwenipu.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/wurevagitudorowixu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/zozemituzedidu.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/87604221198.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/fdd45a4c69a8ddd53535fa8c753d90cd/93796440502.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f7ed7eed---70923450864.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/lamakodokemazakanukez.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/32983952215.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/sedotixexuzinewavuz.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/8im1ca6mh9ku0slkqulh6gri6q/benitaxefefategukilonof.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/81e05361b512f757d0142b6f2851326e/duridowimetesujavetufes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fft+in+r+examplePDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/zajituvorapojovubatuwe.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_off0000b087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB087 14372 bytes
SHA-256: f24d400773f4c3a6dfe29f07637e7dacf18f2144d644a6721ac67b74619fac3e
font_01_sfnt_off0000d45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 10312 bytes
SHA-256: 5fbd0aefa3cff28bc843c51b4b2d7a39acac43361f166d6a13ea40d5b30f8f21
font_02_sfnt_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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