Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb414ed4316c118…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 17:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 60548127797c4cff170770f90885450b SHA-1: 2fccb82c20f041e10c79ea41d99c3c7d0ed44f0e SHA-256: fcb414ed4316c118aebe279307d021b2d53b544a320cc8cf22b5969873bda71f
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. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were extracted, the presence of numerous embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the document's primary purpose is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/709a51a3975dcbb03a5213050aeeec45/38358723610.pdf In PDF document text
    • https://perfecthospital.net/FCKeditor/file/59536456669.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/gemowefafus.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/71491952981.pdfIn PDF document text
    • https://dacola.com/upload/files/86160938083.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/femawafakado.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6ed17767c---rusirisojekanuna.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db237147c3---93346952905.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215151541198944.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/mozopolovazegexixudulagab.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/81072532013.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/25824107608.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e961262b---nuwuruli.pdfIn PDF document text
    • http://ashioke.com/images/library/File/kipigalilufekej.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1627815536.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/jupagezadabebebutop.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5a66a2f1---58101215044.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfdb6e4cc1---zumevelevi.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/78366346071.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/konituwuru.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb5ef5fcf9---13190165078.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bv57o70kbsivnhqa77o8f1crg2/pepazisulipuxarilino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=yanmar+l100+diesel+engine+manualPDF 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_off0000bc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC57 17300 bytes
SHA-256: 106652266f09759ad0a20c640e9b51991f822b207789576e943a095ccf3eeffd
font_01_sfnt_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 10632 bytes
SHA-256: 04d403e01aa5f954b3618e0a699547c86a611507e104edf6eec249e668cc1216
font_02_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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