Malicious PDF — malware analysis report

Static analysis result for SHA-256 1789bc3aac0e264e…

MALICIOUS

PDF

91.6 KB Created: 2021-09-12 06:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cae0304a0d6e726e7fc4c7763c4c427 SHA-1: 6c6e556bb11c0160bf6ece4bd34c7799e24416ed SHA-256: 1789bc3aac0e264e1dcdcad48a2c65994a9f2bbc2d328bf966530e9f56877ed4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a tactic to distribute malicious content through link farms. The embedded JavaScript likely serves to further obfuscate the malicious intent or redirect users to additional malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://pixomot.ru/uplcv?utm_term=sexy+words+starting+with+b PDF link annotation
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcce99b84b---nakewurisuzanulej.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/fivoxadosunuli.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/totonexetopoxixufab.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/93769327926.pdfIn PDF document text
    • http://104408017.linker.tw/files/navalosadeb.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/948221949613d1b1a152a1.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/74102236990.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/03191508953.pdfIn PDF document text
    • https://bak.vn/upload/files/26252350959.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/mibatuxomixe.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/rolizufobok.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zubilapuzopem.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/vndoqaqtc2m4147nkidhif2bjj/basibefobogezosamipadarew.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/vosalajuronidufewemal.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/14868509169.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130614f1ec0c---91897834894.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/96905302312.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/kavejodimog.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347e09ec982---12938887065.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/1293503315.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/91724504404.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/48995368151.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/vazilujojarubowavu.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210908/16310630817517.pdfIn PDF document text
    • 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_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 11000 bytes
SHA-256: a690320acde31ea0ec76a3d1f4833c786f83f0e468fdf6b2cf6991b88bfdfffb
font_02_sfnt_off00012ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF2 18444 bytes
SHA-256: f9a99f27ba9770d46bd26dd872ec22677ce1516974fb6fe5dd2b89ae3f4fafa8

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