Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bd0450c9fb719b…

MALICIOUS

PDF

103.2 KB Created: 2021-06-26 07:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 91989334630bd7a5810d7ae6d0384eda SHA-1: 1efc17e021707d2932df15cb76f4331773adc2b7 SHA-256: b4bd0450c9fb719b332aa691868e05047a50ebb350d1c737e689b0e38afcd07e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories. The document body is unreadable, but the presence of numerous links to potentially malicious sites suggests an attempt to redirect users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0c304666---80214353928.pdf In PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/fopomewunalax.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086af771e170---bamiputijufazerapep.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0095029a---gosixetevetewili.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/subenunoliza.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/36599944275.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/55488079266.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/6260855605.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/xodezalozipulejafadejuxo.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb6a37c6d---56712912313.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160763221e889b---11489941511.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/feniwitunak.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea1dde810---dukasovegabesenetewojevix.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079751272058---wumudoza.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/seguvodiwolajuvidiku.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/865dd65a99c7d64b00c37542dcbbc609/bomanogolajof.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/435301757305e9471c5d00a175c6b345/25281568789.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210524043658.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2348141e---66714730293.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609217a4f2f5a---wuvug.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16076418dc6c50---juxibelilazovudenojab.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c26d303a44ee0a1e58c2008474df00b3/benubesatuxug.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/somudagunukapotajobuba.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca939d327e---10618608958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=only+in+the+darkness+mlkPDF 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_off00013185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001499c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499C 10624 bytes
SHA-256: 70013f51ad4b1a27f239358bb37f999c3d21300417c9e2df36f178d98dd126b7
font_02_sfnt_off000161c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C5 17028 bytes
SHA-256: 92f7426de2c75d34e26abef9b4488230c74ad457b7836231653606aa7e8afaef

Open this report in the interactive analyzer, or submit your own file for analysis.