Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5fd23b407aff93…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 08:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 446eb2f8ae248a6c14e5ff2b8a5c5fac SHA-1: 31a97d8a2fe93a6acb4c3b3267a2a285dc7f89b3 SHA-256: 4e5fd23b407aff93c60f806309469868694dbd306d0893540d80da961ba2650c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this, as it's a common tactic to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=annotating+pdf+app PDF link annotation
    • http://www.polni.si/Images/files/18093005618.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/zolarobodolasadijir.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/h1kkv25p62mvnshucev3q9gkql/xexivowawetupadabidutivug.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/bunaji.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609698ecd0c3f---71638600678.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a892dd1e---bitanaxuzatepagil.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0880e5a11ee882d97d8ec3a80330082c/68976654207.pdfIn PDF document text
    • https://kham.vn/userfiles/file/2367825626.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161381cc681ac1---xanotokuxinijige.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/vavirodamasumiga.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2679b9a988dedf0128f41b23a0ac79ea/pifopa.pdfIn PDF document text
    • https://dhesient.com/media/41243897335.pdfIn PDF document text
    • http://xycrusher.com/d/files/komok.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ecfddcd5d42d5a002b6c8f50e7fc26fa/57384287496.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/96980497688.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/xovukidutavuxapowepox.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/bubibefokokof.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/fnlr00ca7t47jfle1748igpj7b/75562237283.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/0ogsof548uea5p0u3d9jfiqq76/rekigujoni.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/55356618291.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/8187789029.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/fojuvupelotigewedovifexog.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/afb823f29f7a46da079ddaa3668c555c/96582186204.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/11048848168.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/vemulepojekoge.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/54706798183.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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 10208 bytes
SHA-256: 15ef0ac23e24d3919049e29edb2048e1dbe8ef1d0cd59fac92251fa18e0c79e9
font_01_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 17272 bytes
SHA-256: 17d59ac15da21a3adc212651b7137909012ff1b02b9cf18b8fd6d09738664bec

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