Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dac26f54c0b0f9c…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 02:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50f39a501af731b912f6fdb4d05b201d SHA-1: c04a258df60e60bd21d3782bb6cefd4772ba9016 SHA-256: 0dac26f54c0b0f9cfc9de5b75958a9ca7a2f41731f442739cb5d488ecad6250d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm pointing to compromised CMS uploads and disposable hosting. The PDF contains numerous external URIs, suggesting an attempt to redirect the user to malicious websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/78773741067.pdf In PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0f75933e4f00dde6fa6dc5c7c0c0c7c6/37435501994.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/rupikofo.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/vofafururajofereridis.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b857fad4cbb---80195336350.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/61030708571.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16113a9b2ef97a---bekel.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5b9cdaa887738d265d807626fc3bbd1/mivujipamikeborev.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609230d394f1e---42952441940.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090844349ca9---98202872573.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/rejeturulolewap.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9003526e79a0629fb0b1c66f387d93e3/luwukulomusuvexukawidebog.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ec31d221f630ea98ac6633fcba871e0/jobowasovadositekitoba.pdfIn PDF document text
    • http://fittbikese.hu/files/file/79469452094.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607a887ecc741---58624879745.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/84900430219.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780f4c2bc81---71833020213.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/k9dg5p4gdnkhlkgnk2lfb9a4nj/xatovaxizitunivuvag.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/kapitirakunazemudiwu.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/53125835897.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/jobodobem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=phillips+size+chartPDF 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_off0000ce4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4B 16896 bytes
SHA-256: 27ede859ce35493ae10d26a83d17c6c6290ac3ea89d54807f893865925b25477
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 10308 bytes
SHA-256: 35e4ed1ffb445443e4b986d1678fa46aa4d08f16638dcebbb9ffeef6f6d7401a
font_02_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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