Malicious PDF — malware analysis report

Static analysis result for SHA-256 01eaf81efbb83b5c…

MALICIOUS

PDF

96.9 KB Created: 2021-09-05 18:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d54c18e74e5af3b27d1e53955247168b SHA-1: 244b867c53df3d2ea05394bd988355eaf5f9732a SHA-256: 01eaf81efbb83b5c9918d3509b399021df324e41d2719f67bfe3438c93895b1b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://contemporaryteas.in/admin/uploads/file/56637531617.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160928de29ac0b---nunizuva.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/40469155859.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/70210562278.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/95294629263.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/jegogara.pdfIn PDF document text
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/5495151865.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/40597840212.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/54132110306.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/nufuduzefexep.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/3090154649.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5268e0cbe9d62b8f6a446ed9fe7433fc/xovesul.pdfIn PDF document text
    • https://eslms.com/userfiles/file/30443060298.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/85658000287.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/fugiweralifagogina.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/4892928296.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/30148085460.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c4c12189b2---diwaporosazovinolizowe.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/23949615032.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/50338423832.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24c245569---vineziborike.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ef0fee0ba04a7d345e4669961647d395/gisimolavefimozow.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/10573450092.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/82965776635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=learner+centered+education+pdfPDF link annotation
    • 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_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 10456 bytes
SHA-256: afa7d49c6492307c8fc70581e0a73cf9ac0a9cc9cc9d5207d24c7aa0a187c49a
font_01_sfnt_off00012d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 18544 bytes
SHA-256: 4987bf6223230db506a3de71d8656f534c2ab8459b1086cbc65164f564d85034
font_02_sfnt_off00015d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1