Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2529e624efe564…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 03:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a22fd8b530bd0de28e2f46087f549a4 SHA-1: 9eb914ddb1278ca31027058c24b6759685697a8d SHA-256: 2a2529e624efe564f60002b426dea6fc7c9a34e2c0ed2d1adb226053f5cb13bb
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to malicious websites. Several URLs point to compromised WordPress installations, suggesting a tactic to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://chcial.ru/uplcv?utm_term=butterfly+and+hibiscus+flower+tattoo
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/8b8ff6ffb6e09b96cd7c3b557db0eed6/xenazejiwaxozuvofijakoku.pdf
    • http://manavpublicschool.org/manav/userfiles/file/ribugowemikuwefev.pdf
    • http://daeryuhealthcare.com/ckupload/files/femadoxisatunejamixo.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a81203a3a6---10241926999.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/jurom6ps973bkars61e3jisrj8/56141775566.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9eaa06a94---40116484457.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/lkmhku21or1p7i9c476pahqo9d/firipuwid.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wirozozebomedopugupisa.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/kanabogup.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/f17536faff8c0a9ac2f4b3029518bdc8/vesuz.pdf
    • http://poltinik.ru/userfiles/file/51130366591.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94842de63---36466959200.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607375ed90b09---xaxiguwusiluvenapibitigu.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a11f0132140---49864627553.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d37b805febf---71341806454.pdf
    • https://suprizpin.com/calisma2/files/uploads/levadevasarepuzabufis.pdf
    • http://booklandbooks.com/userfiles/file/gimexiworidononozegipumew.pdf
    • http://jr-bang.com/uploadfiles/20210610055227.pdf
    • http://dyglas.com/userData/board/file/domopasevovakobakojem.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc2ac20a3---60408347804.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c306b6da25c---83014886989.pdf
    • http://agcslohian.com/userfiles/file/fudatatisowu.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a8b61602034d0529a29c5488b9bea418/97745394127.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a66bd3134976e152cde54d3c87d0f69d/fesupopum.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609031ffe1472---88025793768.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec01.bin
be5b4a4e775e3b0e046cca6ba888bd9b2cb60ae589a1df92d5ad0125a9e5461b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 11068 bytes
font_01_sfnt_off000105d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 16792 bytes
font_02_sfnt_off00011de2.bin
ab73c728af0ef8ba323799dda47008487bad15a1d7267f7e232e86bc80155ae4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 17088 bytes