Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b9378285027bbb…

MALICIOUS

PDF

91.4 KB Created: 2021-07-30 13:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e6bb3bcc2e4ccf7fa6ae5cf04ee6185 SHA-1: aa60e2593f130a3f1efd2f0a51b2b4f7d6682f2b SHA-256: 87b9378285027bbbedaa354b0bb62af0e771ca9beac49fbc5e52d9864c0b996a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kibbkw.com/uploads/file/fugeju.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4dd078a84---minozarumeboba.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/bimudozilizanogikulagi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5e690ed172ebfaacd28d3fce04c762df/47184167271.pdfIn PDF document text
    • http://www.asslar.de/downloads/59391756767.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/323f2cd8835375807fbc47e73011838b/55064946105.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23b609674---14421591729.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e2f79594---rubesalaraxar.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa658ce4341---96850537767.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/64324436063.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/60079706997.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/sosifozadaz.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/15761722183.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788970792d6---fazozunajate.pdfPDF link annotation
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d3b5d4c3---mugixafuvabolafatuworud.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/707ad4e5c962751a9eb4b2176b5bc493/xibasazazojirakozuxik.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pn7u6s7knrono7pvso6l8f96fq/34526480561.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/1213479313.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lutef.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/fuginak.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/64781025552.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/sodonavopugiwiguxuzefuj.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b52c1898544f2a6e53c095de01e24d06/81420957368.pdfIn PDF document text
    • http://df-foundry.net/d/files/rudusugapusixivuxirumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tim+keller+counterfeit+gods+study+guidePDF 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_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 10924 bytes
SHA-256: 3d130474c80827b0cf4f0691b1992ecaa4b9f2881bd6acad9115c01008116d8f
font_01_sfnt_off00011987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13199 17088 bytes
SHA-256: b330a9b466fc6c2434b3723adb66b9b7ac7d5124a3ff61546f5db36996aacc7d

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