Malicious PDF — malware analysis report

Static analysis result for SHA-256 066c5f2ef8680f3e…

MALICIOUS

PDF

86.3 KB Created: 2021-07-21 22:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1a64943b279c1e8405fb22bc502b3713 SHA-1: ac092b1164f6a5fbd877c4f79dd190dfb53aa87b SHA-256: 066c5f2ef8680f3e219f9cfcec3128ed90e0f7c0d4ae31df7d24c3d5732217e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains, suggesting an attempt to lure users to malicious content. The presence of multiple links on compromised WordPress upload directories and disposable hosting further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://daglichtfilters.nl/ckfinder/userfiles/files/savol.pdf In PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cdae7a42793---44373217344.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/nozewutafevolupejitun.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160985f9a58977---62431291044.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/lokasul.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/redopuw.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/3875840571.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a026580e979---xifafebenezavites.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/keramed.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/domupenikewi.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/69660061310.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/folopapamiwofarodarul.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0811969035c5a9e5cfa5f7aeb645274d/kurixutewesotifosu.pdfIn PDF document text
    • http://malifer.hu/upload/file/digexona.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/jusuvudilerinopufonek.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/31585676595.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/kezatuvepadomo.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/sifigijekovozaj.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/4c080701cba2c195868955d90bec1764/46253755234.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ppr8pjjup4pacqomktggsniqg6/dezogixom.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/55049379665.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/99059288256.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/63497202496.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160819fae40f10---melegukosugasatomope.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094569cc1564---masovomojotibasirugog.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/10915182bcaaa3739cc437f4ae10fb84/nuwebasitanitoba.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd547a709---49862503697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=three+dimensional+figures+namesPDF 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_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 10764 bytes
SHA-256: aec11615b312b25b56eea3a7577078d93b8b177a84c7698444387afa65e6ec82
font_01_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 17292 bytes
SHA-256: 7ea4c2a148c23e9631efdce3ab807f4f5cc5adda9b08724c4a1deeba36436155
font_02_sfnt_off0001331f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1