Malicious PDF — malware analysis report

Static analysis result for SHA-256 16563e8f5953dab8…

MALICIOUS

PDF

89.5 KB Created: 2021-08-09 08:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1adaf4d1d32e5ef82aa4061e80342449 SHA-1: 049d6664fb7ac0f129d500df4580c67e242ec13d SHA-256: 16563e8f5953dab8a1edb3ddafaaca91d6d9cb40389a9770f91b0403cdc3246e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The primary attack pattern involves luring users to potentially malicious websites, likely for phishing or further malware distribution. No scripts were extracted, but the structure suggests it's designed to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://irlanc.ru/uplcv?utm_term=crows+zero+2+full+movie+eng+sub+download PDF link annotation
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c8180293---71342105806.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/fefuvulojupara.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9p9il0ep1snsmm9qvn28d5cq6q/tamum.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/22d82fa30caa34ffb398eee804793499/lakikowowedirijer.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde3492f10f---pijabonedikigikavim.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a5defb7701d---89204330265.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/vebunubinotazewesixata.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6d1136fe---20050828276.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e47df2806a85c3b0adf59216d2d2a3f8/sanubasazinuxudurevixosi.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/24966065277.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ltj21pk4krmucvdnvlb6lc5373/papepejumejofabe.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2f2be6574d829a34fd99b288d2a3bd3a/gakurezaz.pdfIn PDF document text
    • http://kasargod.net/uploads/file/38365584733.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/qp6npuf2bvprvv50jvke7cem53/23300846027.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/37502027684.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e6bdcc16eb5d11b8d447e6d6e2222770/lumawidukururun.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/devivedavigalometobox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6c9aa5ec---tepapoxo.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/84298307362.pdfIn PDF document text
    • https://bursac.net/userfiles/file/dibavi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b29ddaa4cde---54481658933.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 1976 bytes
SHA-256: 42382570eb6b2582d94c9be36ed82b1951fac6e758e044021a12b44444c8cb8d
font_01_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 11200 bytes
SHA-256: d64b0c8631d545990ee9670b32534f2e4b186375b5a23dc5f9b9de352f1f84e0
font_02_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 17436 bytes
SHA-256: 1535aa94232a348d8b9299056f0cede00dc4a35d272a26311149decea2445dd2
font_03_sfnt_off00013f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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