Malicious PDF — malware analysis report

Static analysis result for SHA-256 35885290a5cdf4f2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 11:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d504d7d4d6b27d8bfbd2fa22fea5471f SHA-1: ec253abdfb72726c16cdefa821527b07df5c3301 SHA-256: 35885290a5cdf4f267a42c34a6f517068a185b3edd3dc7c459c013e6b48e17a2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or using disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=pearson+physics+for+scientists+and+engineers+pdf PDF link annotation
    • http://hamyarsanatco.com/ckfinder/userfiles/files/7321545731.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/20a1nue52psov0nlksf2oe3e67/rawasufonumunojugunuvelel.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/16819424397.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/ruwabanuwafajur.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa71a39f5---fidika.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16079c59137a57---bumuzulegupe.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/24896255249.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3uhvns8na2kictkrhblisvevs0/84363144375.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073015391d4b---21835724443.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/651db2d3d5ef252dd0d1b5b6806f2edf/gegiresajufim.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609caedbefbf4---vasapidoko.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b44c4c23a---jexoxizituvabujukojitaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c011c3b6e---4603805993.pdfIn PDF document text
    • http://thedreams.cz/files/kapilulifomovusopipalizo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/30673115761.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/pekebaborifu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f300576c---17338258142.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9c901407677dd3d2bbd87271e68c29e3/87324173054.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/254463c1f71025c45c438353b2ba8caf/vubamemu.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/guzukezezelikakajebiwujad.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/bupipilumabanot.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///gosinewarurojikamizaxivo.pdfIn PDF document text
    • http://fluorescent-training.com/file/xavezudejexi.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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 10968 bytes
SHA-256: e0cca2c086e5160c568e1e2d4f5342ff080c697ad8beea69dde9fc23edeff1fd
font_01_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 17648 bytes
SHA-256: 33e1a09a3a9bbc5eca3c6f3fe91fc089a6b4c271f1242f03a8b8595ea6a6c983
font_02_sfnt_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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