Malicious PDF — malware analysis report

Static analysis result for SHA-256 034d06a1083858c6…

MALICIOUS

PDF

90.0 KB Created: 2021-07-06 12:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0c310451c5c646c3746e7e2b41c9ac00 SHA-1: 6caf7f636406c2fe87f156b406b67aed8603449d SHA-256: 034d06a1083858c694af38c0d03df0f5eba1284c135a4317583fa249fef5cbff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of these links aligns with the 'Malicious Link' technique, and the document itself likely serves as a 'Spearphishing Attachment' if delivered via email.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcd50botk8pd7hdt6lhome84c5/jazejosenupuga.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/5nh25vihigkekqf1sc9qmfeiva/98896636406.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/jikuvogosetegab.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e42054e4e---29794980266.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f3a3d071---22149830574.pdfIn PDF document text
    • https://questyme.com/userfiles/file/dafojilimuran.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1524721a70---nozabugametoromusuvebazex.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///fewaraboxusekipupo.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/bisegog.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ced0be3887---vamenurufewenivexa.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/932ae5ee5b3480b082b61d402cc273d5/fiduzezemejezo.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/96330869777.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/7695568737.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8598a8120e---31738465817.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160785c3e5271c---loliruxiwopixigiwe.pdfIn PDF document text
    • http://e-district.org/userfiles/file/jowukapuwinejinizun.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9d3fcf6f5de4ad3ce5be9ae54406bec/gozuzibofosulumevozibode.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607562dde5584---62037024977.pdfIn PDF document text
    • http://artospace.com/pics/file/xeximizuvutukodosad.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/vewesefedil.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/86154160114.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/sopev.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/152fe90b6ef85adc87ac801548cf86ff/naworufapuvatawajarudi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e4ab824331acc6dde6e557b535430f82/nelasupo.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d6f621f7f96123dc465763e4fc90c274/vozokodesexeduvuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=recover+data+from+android+without+usb+debuggingPDF 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_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 11312 bytes
SHA-256: 3b9bf718ec923a8c73538a432a187fb90fd43c80b5e48aa35c62dd85ff32dffc
font_01_sfnt_off000113d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 17624 bytes
SHA-256: b80726e3259fc681606a750976b823e49685942d04fc51b1d9f18ff21fe55ba8
font_02_sfnt_off000141ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1