Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b3c557dca53cba…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 15:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31bed39df65c46371ef8eea44e46a3e5 SHA-1: ad93cbde6ddb5c975ee241753d8e5592a49b4de3 SHA-256: 95b3c557dca53cbafac3d74f8f73922b4fc59b366e62f930517e603c43655ae3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The presence of multiple external URIs pointing to compromised CMS uploads and disposable hosting, combined with a visual download button lure, suggests an attempt to trick the user into downloading a secondary payload. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a malicious intent to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=separate+pdf+pages+adobe+reader+dc PDF link annotation
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/678c806dab1b2cb1b983855aafc74874/19267721895.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/56871241790.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/82375202476.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/dhb7s9l91n2hep87apppnbif65/46697752979.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/955f29b4ad8d99c117885313b72c95ac/kepibifidaxim.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/kepebipizabunetolepota.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/62052387381.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc6557f50---20489281620.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb287e38ea---4565282169.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/p2ccnsosraakr4v1ek231lsufg/piwes.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/10801778283.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/72616100756.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/aeadffb84ca41a6568859521a28d27e6/diroxezebekimije.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/54958952656.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/73289614280.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///69966300809.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/75274513492.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/44bb43263da8e1014c175a9d9730838b/vonazekonojoz.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/kisuzuduvizim.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c195255fe30eccc78a480a68302f301f/1219786952.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bcd22540f---16767432115.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/59390996865.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78ba353bb---givudogobigolo.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/31117343217.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5e29bd315bc57f1e371a9b8d238f5b3c/62358605786.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_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 10768 bytes
SHA-256: 60512d71c69938fcb9006826d0e3ba095264cd3d75c466634343e3c74572c252
font_02_sfnt_off000113e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 19288 bytes
SHA-256: 0dd31c6e3ed3bd1638d0a9d35f957f07561d900be79e903fade782682e9f4514

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