Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba617b7743770d3d…

MALICIOUS

PDF

83.7 KB Created: 2021-10-04 22:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3b6ef06bb09cc96b27efaafeec7e43f1 SHA-1: a0b2ccf45657efe1c8d059b8940a3d50bb466618 SHA-256: ba617b7743770d3d5390332176161d136afc6e822d0146806047748c58ea9252
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common phishing tactic. The presence of many external URIs, some pointing to compromised CMS upload storage, further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://huntic.ru/uplcv?utm_term=wish+discount+code+free+delivery PDF link annotation
    • http://hnc2.com/userfiles/file/50380272492.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/29742512098.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109242150435576.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/16220260148.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210917050044_Z2VkYWtpamFnYWxheHV3dQ==.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/fexiwomajukezesamurose.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/31156346246.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/55696750574.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4722b53e4---6896598839.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/76530264040.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eddc8d7e84---37392521437.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161403fa750bc0---37796470811.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/84288134741.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/46444065617.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/boxeveludukomixuw.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/bixogopopexukipofiwofeso.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/nijiti.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/31209608368.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/fidumenapolaxubo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/gupuba.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/pezuxipow.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/pefuzef.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1615a25c77c434---gatodivabipitoputave.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/kedudopemagamatedujimiri.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_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 19660 bytes
SHA-256: 5c47c74b63855ab1a718074e41e2a9942ffb734d90ad688d61c682159ff19fa3
font_01_sfnt_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 10684 bytes
SHA-256: 8f1cd62c5f3310458110e68c952cab89f14e31e6eb6538cab787aca5b378a73a

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