Malicious PDF — malware analysis report

Static analysis result for SHA-256 090f41d4c34d2d50…

MALICIOUS

PDF

85.2 KB Created: 2021-08-12 08:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5a0806fc1fc5d4d24b423dc8947f93c SHA-1: f98e05c5972a8ecc52bcec4c79cdb0f82587c3f9 SHA-256: 090f41d4c34d2d50e8d3daca2ff1b4d47245915c3cb170e759b401a0049c4e7f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness, and the presence of JavaScript suggests an attempt to execute code, likely to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c473be3515---13553490014.pdf In PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/4c412cf446865c5c1b0a87e427049913/72182966066.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf908aa8f---xebixerasujuxelalevowuneb.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/87013129176.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8e29697560961033937bc5cc002b9536/fatamelojadon.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/95009636018.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9add52f1253d3e60dec5f6163c4c4364/wozumolux.pdfIn PDF document text
    • https://limsurdua.com/contents//files/33658557652.pdfIn PDF document text
    • https://toocapen.com/files/76860647863.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5bca81b2c64004edc5ffac655ef166f2/nefawimenawusuv.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/89085541932.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6fe184f5ea18ca12172a534526e61d00/xagilarewivinek.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a126d50b6b7---zipejadojodezi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/9lncg4pqbsrqajustv6uf2fjr1/19286215260.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a67c1ef82---7410843366.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/wuburijenanomusolatukop.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/46538180961.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092af5b3faf3---lesurufosenib.pdfIn PDF document text
    • http://vo23.ru/upload/file/74765080245.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd167422d---mepopexevimakejafiju.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608c59cce7d85---6380926943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=formato+de+certificado+m%C3%A9dico+cdmx+pdfPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/43398052925.pdfIn PDF document text
    • 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_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 10696 bytes
SHA-256: 70159c29eaab8adce654f9fd2a7bfe46a85fe16f646b205d37ee34ad172b13f1
font_01_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 17960 bytes
SHA-256: a2c12567159b79eadcdc7dbde94a382e74149417ba5df9042dfa3c5eb54b2e14
font_02_sfnt_off00012bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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