Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bf4f3b3f87cd37…

MALICIOUS

PDF

98.5 KB Created: 2021-09-02 10:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 01dc7505585748af2b52b3dadbdb1da7 SHA-1: 2ac7caca143ca6720f9aa5fe2fb7ab8fbbe1e376 SHA-256: e1bf4f3b3f87cd37aaa61b58f78c456b53da9bd6e78bb69521a85bbb6c73cac4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076521bc6dae---pawajevedititufujijis.pdf In PDF document text
    • http://www.urbanwaterways.info/files/mobokubofapotisibexoraruw.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/fabugiketixokojobifafova.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/nipukupus.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/gurafejenireworubagoj.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb24305aa1---fepuseme.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e9c7c94f5f9de89843dad9fc4edda83d/jemexipag.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/pijogaxosufedisorimavog.pdfIn PDF document text
    • http://funperm.ru/content/file/fuzanaxegezovofer.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/46548354202.pdfIn PDF document text
    • http://shamayachts.com/upload/file/12430815127.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/25bccd177bd15bd848793438f59ab272/dikowovukobawerimexubi.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/sijote.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/90532440804.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/97691840945.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/pitasevikeronu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab01da541b8---94353374892.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/19194460501.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/89250543069.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202108101503017717.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/41161722282.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0715f3c2c---tizumexopuniridutuv.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867b392dcde---vufozunadowofenasot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=god+will+wipe+your+tears+bible+versePDF 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_off00011ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 10828 bytes
SHA-256: 656dc19abbe31f48f4bd45a46355716aa33a759e28c14fbcb7f7fdcb8d1fcc34
font_01_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 18316 bytes
SHA-256: 4e9db4bf7f10fa37c001d469d0c6e35c9001ff9a705c91e61872c6f94fa657f2
font_02_sfnt_off0001647c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1