Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9b29f5962c3341…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 18:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ed8ec5e0067fd7edf2e0e2a1f491f29 SHA-1: e256851d655376d6f3338e64fbf171b7d9f3d184 SHA-256: 4f9b29f5962c3341da49b85f234dff84d4885130a53afafae22ea79377488662
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. The SE_CLICKFIX heuristic indicates social engineering by instructing the user to run a command, likely to bypass macro restrictions and execute a payload. Several URLs were extracted, some pointing to compromised CMS uploads, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dda40e408---80282220338.pdf In PDF document text
    • http://sukhonthip.com/file_media/file_image/file/fikejilovuxo.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/79231127505.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109130038174968.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/gogovupibotul.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/35554125283.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458c566b78f---seneruratalodepapexej.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/jaxugegevukotawipud.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/mamabitasovubapibikaf.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/15426417141.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/resafumaladikavadufimut.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab9e50630---78432684974.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/kanutegatogigumabixedatax.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/22800812427.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/26257247665.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/76764073605.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15978938420.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/31231399454.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/97485535619.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/13128906309.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/gedepotaboxexaxokug.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/kexufi.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/tewele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=az+screen+recorder+corrupted+videoPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/8990582528.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_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 10508 bytes
SHA-256: 0d8ff4252d0be619534e02801305105fc7feca81bb451a8a6df98488d4f5e0e0
font_01_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 17232 bytes
SHA-256: 986b3a0f494ffd314caa6804b12fe21b0aa95346b19bef2f994f48656cabb6ba

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