Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b5263cd2509c2e…

MALICIOUS

PDF

98.9 KB Created: 2021-07-29 16:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a179d01dc3d3fbe5f50a90305ea272ea SHA-1: a5e3b5ee3e990c2994551f4dfe670d8467c3944a SHA-256: 96b5263cd2509c2eb7056e0907818656f9328d7fd14b14ecd3e3ed83efbc52e1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to manipulate search engine rankings. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and compromised CMS upload links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://alphanaturehk.com/userfiles/file/gexojuwupadanelafaromu.pdf In PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c6736ae04---61244537081.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/boxulusudenipadiro.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1487c1fced97e1dd17fe966997692af6/96164557316.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082962f82e05---semigo.pdfIn PDF document text
    • https://duvanco.be/docs/files/35176744852.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/236216165.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/88656962069.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/41262246265.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d6huvimightjmnjqj0n7s692f2/sodiduto.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6c976de3b---33192895676.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/muxojumuvema.pdfIn PDF document text
    • http://candientuvibra.com/images/file/62372102195.pdfIn PDF document text
    • https://artenika.pl/fck/file/garinobevi.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/070317594079.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/181ffee3454794479f35b922fd1b1350/89862405980.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/s6t6k6se8u61pgfg1s5f9nibbg/firib.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/89427098341.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/62666709312.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd73e9c78---6217336524.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/direnogilesevu.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/powefigowojinu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8a5f8bf153b5f730b2a38b57ab53a68f/ximemezi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e51d2a6f---2095609597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=metodo+de+ruffini+ejercicios+resueltos+en+wordPDF 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_off000119e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FC 10616 bytes
SHA-256: c8e47eaecfaaa8ca3a72841aa7e54a9bae1b48627887142f2b189f3fe1667f86
font_02_sfnt_off00014a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5E 19624 bytes
SHA-256: df0eded9b6d83ef5ae50108afd6b4dc5a5be94e23eeed44084967fe69f28c76e