Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d22e26b3e77b8e6…

MALICIOUS

PDF

100.5 KB Created: 2021-09-04 03:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ff125a2f8259843859a23a22f29fca1 SHA-1: 751261dda1a06785395604b242276799cbe557a8 SHA-256: 9d22e26b3e77b8e62324692182c0bf4f9da9b9aedc689aaed0ce1a7dd14d14c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jokum.pdf In PDF document text
    • http://speed-r.com/js/upload/files/tafetenufojokusan.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8205e5fdd0---40850015039.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6bjosii7epdf3if823q79nrvs9/kewutiwiruwakifub.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886a5b57e99---tekezepanibinabidotuzi.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/b95ade9332fd40441b6a0bbb741dff1d/nebuxutamituvu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b86b655381---57902372942.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/jelozobewelunopo.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b50fd7bcf8---60590817332.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/76595045907.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde23a98e1---59761940047.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/giditozozizanuvusejafes.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325369bf3e---34788896209.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5eda556b---kobogajum.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9f52a3d1---8498247340.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/4659937960.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/xowugotevezetu.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/88205283776.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/belajoso.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/budelomimuvibunuz.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd959c3253e---tizegeroxarerolewu.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/40844122845.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/69154489222.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f4b1e4a1---lasafagelidanidevefa.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/30771397723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=convert+pdf+reader+to+pdf+writer+online+freePDF 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_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC4 10508 bytes
SHA-256: 7ee19c76402d050ccea9d03fdbc6eb4bf6fd0ac31d81b1d2c77586b75f93c83d
font_02_sfnt_off000152d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D8 18928 bytes
SHA-256: 05477e55cb89196bf4b25bcefcd67c1aaade8e708cc1950e539c86f417847291