Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade5cbcf325d3b55…

MALICIOUS

PDF

77.4 KB Created: 2021-08-26 22:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbb0770d2fbd1ce2ded8bff25d5048c8 SHA-1: 877b1350e9fac569070b33d11341c742cfd0f557 SHA-256: ade5cbcf325d3b552e95aac59fc2fb6203fe81b244ba01c62820d24bca1ef55d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm hosted on multiple disposable domains, a common tactic for distributing malware or directing users to phishing sites. The PDF structure and embedded URLs suggest it is designed to lure users into clicking malicious links, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://handinks.com/ckfinder/images_store/files/9349143552.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f355c2caf---37367028666.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/71292756245.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/27800639095.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/sewoxafami.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/ratufovajavipijuto.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/49778456828.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/32715117484.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607636561b9ae---pavatepabixaxelukunifar.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7005d3b74f---beparutizigepunufopu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f886067c00---18799007168.pdfIn PDF document text
    • https://serka.com/serka/upload/files/naledi.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jetulogi.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/89977753900.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607949f3b9e9f---bujameraroduxabozeriniku.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/goxuzuguxa.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/75229710841.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/28545958290.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/nalulil.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/36510648649.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d63e024b---64128759457.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/lovavuxutilesip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=easy+throw+together+lunchesPDF 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_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 15984 bytes
SHA-256: a6d7abfb12d31c8dedf27f4603ab51b5a3dba61bc2935ad0315680fceef95434
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 10700 bytes
SHA-256: 6a30e13e40b8c8dea8afc233030bcd665f7880cc2ed12234589fb1f86cd5de88
font_02_sfnt_off00010ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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