Malicious PDF — malware analysis report

Static analysis result for SHA-256 3342e8e04f43f488…

MALICIOUS

PDF

88.9 KB Created: 2021-07-04 02:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f493a40a45b979f0b9b106f1465c7731 SHA-1: 34abe7ef87d5e47500183e2e33a98dc601667945 SHA-256: 3342e8e04f43f488ce6533e468ba95a6132db404b73ccefd6d07c45a22c17a58
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous distinct hosts and links indicates a coordinated effort to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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 https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a393262f830---kalukifa.pdf In PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/lireralalik.pdfIn PDF document text
    • http://cuacuondaiphuc.vn/upload/files/41658303854.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/7aa401919f2bac53a163f63db786f599/zalutavujidirajodiravaza.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/917a7e6a4070789acc2de17039985531/60674748252.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/onuod7ng56mj8i8mor3g0tg7ne/vepowawuwagi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e69201ea3075201a7fb6723aaefe7ed4/56141847796.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/el29h337qb3g15vd3k7scomb51/wepemidibunitigigozogo.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5d3453801a40b8c741492b50f684b371/bifudalavumef.pdfIn PDF document text
    • https://seerupit.dk/assens/file/gobujuruxizunez.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160dde358e46af---101455170.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db4566a2303---pigasawawupilof.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e998d0803297c81a376e161238d15a10/lupuwarugijafebivadabizu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bkhfobu0s63q9k4boic564kbg2/xetixiwegaluwulupowefuz.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/dusizifinubop.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/juwepotidofegisigikuwuma.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/48600950502.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/dkerhu1fnm37lbmj8sf9abqo74/difabivavunoniburarek.pdfIn PDF document text
    • http://taechoclub.com/FileData/ckfinder/files/20210614_8C6AB595CC2F7314.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0abbea8d---fadenetevi.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/tolelujumepidav.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0627bcb65---28526517505.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d943c9a8---supawomexapop.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5bea12887eb8d82bf0f471b4ace319df/29117357941.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/j9tr4d7tu1hh6r5bgqldlaamce/pepiluwusonoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=react+state+in+componentPDF 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_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 10432 bytes
SHA-256: 0558023a1e893f9514e8ae5dcd27d0e514d1e1641774f7442f3d50def4703078
font_01_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129ED 16792 bytes
SHA-256: 32bff1b0952322c20e178272cde4967f2c7e4a0d4dcae1372163bea7a15779a2