Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdaa854ef28d424…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 12:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e791ed91981fc4cd17c4a8f0758f81a0 SHA-1: 418ff35e10aa862d3628ae27fa3c690a890cae5f SHA-256: dbdaa854ef28d4248cf693513af43e99611e5defc1a5ad307f324893b3fcdeca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics suggest it is likely used as a lure to download further payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=commando+bollywood+movie+download PDF link annotation
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16133b53e45a17---dipapugodidikuzudobe.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/budaxetusupa.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/gefolu.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/98897653670.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/niwufarakevokaxosopuvik.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7d23507c957ee00d5de7883db79a5477/ketasulupirujuzavawabuzi.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/vawodakadepelupigil.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161407317f0b95---bevimi.pdfIn PDF document text
    • http://myphamasia.net/upload/files/71564549817.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/refipalefukemi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f734b66c5b78d153b53df62f295c50e9/zatimufimobumim.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141287864f21---6252285812.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/58635560694.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/rupisimivexijefebolimogex.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/36592702932.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///1101633213.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161356ca028a8e---zibukerobewawezubufobeniz.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/dusejuwadefebelugonopixu.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/fimobuwexoxexak.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jdpo79p9a6l7nogdh00roprmk2/87857684813.pdfIn PDF document text
    • https://www.parcdelorval.com/ckfinder/userfiles/files/gogidumoxirulola.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/40534727911.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_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 18108 bytes
SHA-256: bebbddbea116876ea8768688c2dbb44de901d12ebf0e4f9ec69cc8eac92ed5ec
font_02_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 10480 bytes
SHA-256: da937fb9b1ba93eeefd56d7e2a80d8d42df59911470afa4feac70dfe3b5cbbed