Malicious PDF — malware analysis report

Static analysis result for SHA-256 22456e250fb4a7cb…

MALICIOUS

PDF

85.3 KB Created: 2021-08-29 20:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 998ba56e6bcecc42b3d67b9899dd9019 SHA-1: d708679788160e92bb6a61fc68e8a02869a58b3b SHA-256: 22456e250fb4a7cbd4d4d6006c6dc3898ea13828c6b5d158153005348fed8003
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute phishing content or further malware. Although no scripts were explicitly extracted, the nature of the embedded links suggests potential exploitation or redirection to malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://manavpublicschool.org/manav/userfiles/file/25830780323.pdf In PDF document text
    • http://influences-vegetales.eu/assets/Image//files/39356007386.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/90e7e9e055cd36f05ed0bdde4ad134eb/matibakam.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/93156945638.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/78238428941.pdfIn PDF document text
    • http://senn60reunion.com/clients/876260/File/xujojoranekurevomevik.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5da28d2065---71938890473.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/timim.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/49937919070.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5ff228cc4---76723272534.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9cb327b30---39648025562.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gefaxitakewedo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/bo54vkrgt2ed06p9dp66jjc2ec/fuxanedoto.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/66748869062.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/faef7b4af8f73438ecaaefe61236c1ea/26332368661.pdfIn PDF document text
    • http://ippon.lv/uploads/File/29775732902.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/14721132735.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/30157875853.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/27517183456.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d1beec962---19442691492.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c79fbe3d0---6404859093.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7ed4b0c54a315454bd15a5a003e45fa6/vofejudupareze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=highest+in+the+room+code+for+robloxPDF 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_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 10992 bytes
SHA-256: f1e1b5279447fddc25436422b68d8cfcf54d41b407cd421fa7c642c0027d724e
font_02_sfnt_off00011350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11350 19460 bytes
SHA-256: f9a6b07832f4d9cb9d12b229b9b2892f5218e78110f6513c1d42d2c3e5a70ab8

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