Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafa771c2619052a…

MALICIOUS

PDF

94.9 KB Created: 2021-09-05 04:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae7a46f8e61e0c4c15b0bc2866334eff SHA-1: 26c070b496613dcab9f5e843374ff14be00a2b23 SHA-256: dafa771c2619052ab078fbe3cbc8cb447c9bc280a4d2a2f482bb92c79a4a9c73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://omonetach.pl/foto/ilustracje/file/kabebu.pdf In PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/80214442668.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607654c8d584e---dekalevu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/xefewakigegugivedixed.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/l47cuuqk6nhtlooh0k8o4hlmuq/28078899967.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/2m67sg9849a8nnutn3t11opaqp/45378968400.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/37999331537.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45fceb1028---30699001426.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6602655c1b8ec5be0f4098490e0d9270/sajujipunifewirogisa.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/41442998144.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/90630856073.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/zesesojopipugedubesogirul.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/rudukobotuwubitupu.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/19679672692.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/renonotigakezixison.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/ganufejasoxofifasozav.pdfIn PDF document text
    • https://jss-moms.si/upload/File/kizufasigivoxakiliguv.pdfIn PDF document text
    • http://unsersohn.ch/images/file/futubudojomi.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2ed7ca27b---mazuge.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109891305b4f---tigamikojozez.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202108140749213435.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bd3f2d2d3---rixatutabu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/97bb1639154fad196550f5b5ab01aa7c/talurodezok.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/iu7ln1ddau6bk6m9dqrnhvbq05/1210992177.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/kakuregofezewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=comptine+d%27un+autre+%C3%A9t%C3%A9+guitar+tab+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_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 19772 bytes
SHA-256: 89bab829ff9bbb627ed4a64446deaf682ea49e995771971ae98249438b24bc62
font_01_sfnt_off000139f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001520c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520C 11084 bytes
SHA-256: d44a4abe9f6adee1b5962dce57b0ebd3eea048cb2d6bbea5d38430aa4e7a5ad6

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