Malicious PDF — malware analysis report

Static analysis result for SHA-256 def7a12c76220485…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 09:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12ce024d2efb037eff65d20a436cd899 SHA-1: 8ef2f1c867da0d4e1246a4dee3befff6389e622c SHA-256: def7a12c76220485b2461ef45c1f24557df7571c27e7c1cdd63b04b77c4cbf3d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised upload links and UTM parameters points towards a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://wastran.ru/uplcv?utm_term=yeoman+stoves+manual PDF link annotation
    • http://phuquytravel.com/nguyenvanlinh/files/62836134213.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/fobedof.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/kefoto.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a14fa54c1b1aa05f8a5f331c243f1221/56462621241.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7299973844.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab134c3a79c---20676483143.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/9307484674.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/ripufebefaj.pdfIn PDF document text
    • https://efnnma.org/files/file/40362464576.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/rupapemudekobujano.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/b1o35861r7oho8kvdl1s3eo9kn/nakimutolebesise.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/80497839100.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac411bd1e51---xaxilokogirabum.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/pisezukusarizuvogutoko.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0978744e0639cadfae466ce6280ff1e1/sofofedokikil.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/31807685483.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7e47b26d---fonegizadugoberulovumu.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/56634871503.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/90037653460.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/fefamoge.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/sirurebusugogo.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/2847403442.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/1426432509.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_off0000b8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C3 17240 bytes
SHA-256: 7f721d287c1391f27e00c71a4f3c5c103fda57bdd60bd8d1d3e00a478e2a8520
font_01_sfnt_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 10224 bytes
SHA-256: 153b21fbc711aa0aa561ad65c2b420b350bbb9c6d265ca47a5adbda1b12ebbb4
font_02_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1