Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7b7e1ae4ccc8a8…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 15:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8920fb23e85bc9dd0e7fccc8e6081acb SHA-1: 9aa42de2c4386444b87a2887a2139fa7e4b228c6 SHA-256: 6d7b7e1ae4ccc8a85c8359e93f9cdded74870fbdbb37cd49042d3dcfb9485dc1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs that point to a link farm hosted on compromised WordPress sites and disposable domains, likely intended to redirect users to phishing or malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=how+many+steps+to+burn+1500+calories PDF link annotation
    • http://paneldeconsos.com/userfiles/file/33657282888.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/4651809821.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/gofaweverujowigijuj.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/94663526338.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/28d35a60d0918a14599dd36bbf355134/74593482073.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/727d1d60167a6d25172dc82fc6926bc6/kebibit.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/2709667390.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/32182793153.pdfIn PDF document text
    • http://novafish.it/userfiles/files/40500569339.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/95817567285.pdfIn PDF document text
    • https://sardiniagreencoast.com/userfiles/file/6802931880.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/19863141876.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210925052639.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/fepigejewomadag.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/56863713787.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/miwatiromojudifanedonerip.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615825ad9923b---xazepizi.pdfIn PDF document text
    • https://what.whatproperty.ng/ckfinder/userfiles/files/riboxura.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/jizareranirale.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/jominububevavorogin.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/vopusawixufadepejusat.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/24686598089.pdfIn PDF document text
    • https://lecachet.fr/docs/files/44033907922.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/92721967107.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_off0000af59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 15824 bytes
SHA-256: 21b6e3d19db047257127e286af7c897f946a50a89185be771fe2ad3aeb3151c4
font_02_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 11276 bytes
SHA-256: db559633bd5427608655542b8c58633b819b6912a5a1a559af210c8414f2eccd