Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7e3423311c4ecf…

MALICIOUS

PDF

91.2 KB Created: 2021-07-01 12:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8767a0bbf916a0fb06ea2c1d5be86f93 SHA-1: 2b2db6b31c97bd931ddcc6be8a08b93f8abea037 SHA-256: 0b7e3423311c4ecf86536bb0c9e555e335e1b7831ca88623b6dc90a95c14f7df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a79b56d58b9---90929032925.pdf In PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607613a74df90---32955724138.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/fegizamojenekiletagoxepuz.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f21633cc4---lojozug.pdfIn PDF document text
    • https://agatanorek.com/files/file/64948008077.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4782da5dc3---jewilajobutovij.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cc52df626---dokelus.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2ada3b5a481d6d5aa872925383ff6931/dumak.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/14243770172.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/makefidoxujog.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/98490327926.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/ravinowojas.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/sigoguvo.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160869d15d4e0b---30272017643.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/28855730514.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/nkn6uj5cqstaqsvp16f0kbi0f1/mezakenijodekuwup.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9662219110---nagesijaka.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/faaf42977cab1b9abafe2374968bdbef/xunejerok.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083df14d1ab3---3136206138.pdfIn PDF document text
    • https://petala.gr/userfiles/file/mojojo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b121ae921ba---33056565309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=therefore+in+shorthandPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 20588 bytes
SHA-256: bfc22dcabb0c5ac45f4682a7b6ea9d3590cc4d90319131718c56a979c0333f75
font_01_sfnt_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 16144 bytes
SHA-256: 1bb543891201b86cb218c82ce0c1e431878b85d3145a79f40ea94bf38162e691
font_02_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 10368 bytes
SHA-256: e695925244e2e346c985dff4f6d22808291ff5bccf821fc71ee78f5c1640aa12
font_03_sfnt_off00014598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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