Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c351f2f5080d5a0…

MALICIOUS

PDF

90.1 KB Created: 2021-06-28 00:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: da5d85bf64d271460f9944dac6a76507 SHA-1: c73193056dfda89795b3e9d28746623823f09165 SHA-256: 2c351f2f5080d5a0dfa0d9b74745ea9ae4e33b4276d2672758ccd1aaf6d2560a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript and a significant number of external links. The heuristics indicate that this PDF is part of a link farm, with many links pointing to compromised WordPress upload directories. The embedded JavaScript likely serves to obfuscate the malicious intent or to facilitate the redirection process. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/86c554db4aa7ff7ac2f9db4ef8d08b1f/bugimonarukom.pdf In PDF document text
    • http://dade666.com/userfiles/202106file/2021060808574470554.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e365bb8cfa---76077172454.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/04295142beaeb1a996ad83bc32ef2468/91822440081.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/logufeserezafod.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/nadanotalomenulumebezubut.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/40641812736.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/sosegubawasaxedelo.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ef2gmu0bo188f04e0kais724l2/varax.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b3fb37437---kadoninilugomifosanolelar.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b614202f2ac---mutobubumijipiwotawibu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae5ff31fb---33922176693.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/lemow.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1623905201571308219.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/ropifixijevelaxazipirew.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/deposanusolipisiwuna.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/rowikojoxukajinelos.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/fdccdb3d0eabd5399174175d311b7dab/94613100537.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/a5abb3e5885100fe14085d6e493ca9cf/92270597929.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/tixovoxogomemiwofujejoro.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ac06311fbe8---98346007046.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fd5d4bc10---bonodikivox.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f1b57f86---57056286766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=clearing+of+forest+is+calledPDF 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_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 10684 bytes
SHA-256: 3916728726426078db7f2cfba7c3ee62e114a374aac1a6848a7e18e804c062b3
font_01_sfnt_off00011452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C64 17664 bytes
SHA-256: b46922d1313a7073919499b2235ec82c318d700e62b5ef8546eb0ae2912583b3

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