Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c74db24703ee434…

MALICIOUS

PDF

90.2 KB Created: 2021-09-03 13:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8c6a13a51157b94f806b12d0c4c481e SHA-1: 099bf48d739eb0f34e82b4ae6805226c12d3be34 SHA-256: 4c74db24703ee4343c7b4ec0c22bde5e7e6803a8ce1bb7612497e6b27d3986bc
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the embedded links suggests a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rolcsi-bau.hu/userfiles/files/92945807423.pdf In PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/jegox.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160774b00e8daf---12940860557.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/kesadinavawuvomabegufe.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/97203846699.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/xumutunogibe.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/3d30e13127a689c3c934a89823c26944/30345225578.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/wipozidebupukifutapivefi.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/1csgplldfn06vnfluopvqrg66p/wovurutuwewutetij.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/voponimirovorovedixemuwe.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/kotekuwivizej.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/46971573364.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c55698508---91288483580.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a915e6d64e2---46680044217.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202108260645553187.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4401dac8bcf7784cf9697415e643af32/62503768159.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20218176248.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/39204013203.pdfIn PDF document text
    • https://ckmandarin.com/uploads/fugedijelemibojetosafo.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/2qi51mckicnej91r1g352re6d2/vazopupob.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ee52821b1158f6cea3807ce251fa5ee2/netokepufotamevukav.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f93fbe8dbbc4ae7ab7e8ad0265287af7/39291620841.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/pobetajaleba.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffdecde20a4---29809813918.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ee546c6bc---likuvisananu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=presentation+skills+quiz+pdfPDF 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_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 10888 bytes
SHA-256: f2c02ce1bf963325c1e89793de003f307f4ff3268a4b4344a617275a97789ef4
font_01_sfnt_off00011503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11503 18004 bytes
SHA-256: 6b26fb993e8d6299c5ebc17f36755e1a88b5c7164446441202867f861fd24886
font_02_sfnt_off0001432f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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