Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99b60f2fbbe7a8f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 01:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c58bfa16e9f8d32334f41fa05778aa9 SHA-1: 548b811b72dfe6894a620b83238746cede4973e2 SHA-256: b99b60f2fbbe7a8fac084f6dc1ef12d6618e388471390314c0a0fe5f2c4f803e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ixtvs.de/_upload_bilder/_filemanager/file/megalozopet.pdf In PDF document text
    • http://st-johnson.com/Uploadfiles/files/dafogumuvozibafapupuzixa.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/96216768610.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/wanofetoda.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/71347780099.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1ea87869470e3c26e074a73de24b8352/tidepuwudekezifaxorax.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/gujipexifun.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160745ea7ad3fd---95815704692.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/19622599378.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5f5a20a03ce7cbf34050c66c5a10e3a9/76036747603.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/67088165607.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b5633a66680---mitatazitewugojajujowu.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/88492826054.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/23486479804.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f6803e5849b---32501894145.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a29eb57fd5539c903c125f2f5839ca39/sozarasuniwajete.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/dozoborote.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc64fe11f6b---lejavomegisala.pdfIn PDF document text
    • http://12shio5.com/contents//files/1383526290.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606eedd7a0d30---40577692458.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-12/20210612040526602642.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/38525202617.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/74199041184.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/38189771818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=convert+pdf+to+dwg+free+onlinePDF link annotation
    • 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_off0000bb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5E 16540 bytes
SHA-256: ebdd259951824ed04d27fd70e72621b50a6b7cb0a826df99aeb9936eb21bc145
font_01_sfnt_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 10528 bytes
SHA-256: 95a4080682cee038a6d08a84f2f8287ae5a099bb5b44757f59c7cd2085340b42