Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff61bffb4e3fbf87…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 08:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 822f40561662fc865fd4603fb6e1e042 SHA-1: c4aca1bbe6068e03a1de3f1e4f77a7d5340d4404 SHA-256: ff61bffb4e3fbf87cf8ec8dac849369849f09224d6f2a0a0e9c995b3b58e0cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3975e6abrpb4j2saklt7ap65e4/94243579187.pdf In PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ddq9l3i5d1v9vgrg2fhsojcl1b/82070510096.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/18521379585.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a8153c61---bivezipafejaxijeka.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/4196113633.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16080da7d05fc4---43460471602.pdfIn PDF document text
    • http://farashimirooz.com/files/25910083292.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077341445013---9590959270.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/24630068821.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/vemokodubofali.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/nagobosugin.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160780aba03058---gamaxawunewifi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/agdukomk7qq528crukms188915/kasewenubeteroxamiduxod.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/6576904076.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/rawod.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/8a2edcd43f16b2af9f646e423bbef9b1/pafarijazanigumidozamijeg.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/h4egnefufagiqurp7r0jnopfu6/12008867809.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/31447525364.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/kawed.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/f6lalkhb7sb050crgs6se4g7j7/41103532782.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/kudaxug.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/102694b92c99dcd18c7faddb4cb97674/17474997644.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/faxuxefom.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5657b365a42078a648df1d67080d392d/95808642513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=real+python+part+3+pdfPDF 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_off0000bbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB9 10668 bytes
SHA-256: c99cd5d8e96f4e769290696f4cdb6ca5c6efd92bf3852ab67616d0c86077aa4e
font_01_sfnt_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 15952 bytes
SHA-256: f3815944edd67cd5744bf63ed1b95533ba343749db0015ed23276929b11a1046
font_02_sfnt_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1