Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6ccf39cc5164a4…

MALICIOUS

PDF

97.5 KB Created: 2021-06-30 22:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 476bdceb16c66f22a26c17f92041e128 SHA-1: 819e133a6b82fb1c1da8dbf36dcfa292b447cd61 SHA-256: bc6ccf39cc5164a45126a077a3e87d4bf713f0bfbe3ab5589b7b329730326027
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a common tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://infrive.ru/uplcv?utm_term=how+to+make+clash+royale+deck PDF link annotation
    • http://macabrey-luthier.fr/data/Files/62444243314.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ff86f021ebb33cf02fd08da897495597/17466060100.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/jowaboxugoxozub.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/37617227256.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c506369ba705dc336df8bad2e2cce123/xixasasorinuwagugidezewaj.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a51df8313c---gekorunudutotuja.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/fl4r01slr6ovu89mjqulcek656/sanixaweb.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/8114155081.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/vinaxokedebarotogo.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/lukirog.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608eba2c16ad0---72241083836.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/lulejakowumilaxurexim.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/43192530371.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/51583060992.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3e513c61b698ff47a7012032f40de815/wepikojiliwewov.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/qvo71njgsgbvokd07d9lecmfln/78450101926.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/9lvvfoni8ven4b6nff1bufn586/loxadarivudazopake.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210605_76C95A84A865A637.pdfIn PDF document text
    • https://songhong.info/userfiles/file/tonuwegokupidi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff523bb23e---67334238397.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9e5a62ea---74969755603.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0360e0d9113e9b75a3635d837d3a2276/zulaxumomubosovib.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f1fc886eb---bititariwazuw.pdfIn PDF document text
    • https://actor-conseil.com/files/file/86713655670.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_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 19908 bytes
SHA-256: ee836cfc18b51ea1478101735793f6b965529328ed89854bd6dc70c336ec0cdd
font_01_sfnt_off00014630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E47 10720 bytes
SHA-256: d6fd6a50cec9d28ac96c6ffeb9a87de9e95a5caffce93f2ca4641a2e340ea1fe