Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bc9fef4017a024…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 23:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 091ebcdee4fdcda8953bf02dee25de95 SHA-1: 37fd791fbbf07fbff3b944bd191a28aa9c727f55 SHA-256: e1bc9fef4017a02477d0a737917b28394caa50a48562e864efd277547a18289b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of multiple compromised domains and the structure of the PDF suggest it's part of a campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=subway+surfers+mod+for+android PDF link annotation
    • http://interroadholland.nl/userfiles/file/fugevupajobisukagebi.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/bogotolelaxukujazefonuwon.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8a66f744---zelitowowevemol.pdfIn PDF document text
    • http://ore-processing.ru/d/files/29292076487.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/10823169370.pdfIn PDF document text
    • http://iwort.de/userfiles/file/48245682222.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/papusemok.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/xerelu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7a5c703a---jetijib.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/82756407515.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/dokabugitep.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/vepunetaxuvesejujifatav.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/jajasigubi.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/gugedibubobexewebori.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f95732661---66985089577.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/92164344748.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/89334800271.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/95801484127.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/48730737322.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f820d9e71e---77477310674.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/9154622713.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/firuv.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/relupaluguxidej.pdfIn PDF document text
    • http://theponghop.com/upload/files/4373821395.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/lekekolafakikada.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_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 17960 bytes
SHA-256: 1154b44b48a623687037324ff2943fd656857157f08db2f35113f752dd625b56
font_01_sfnt_off00010d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 10884 bytes
SHA-256: a65e01d468ec93e11bc81d466ae2f15ad6feb0bafa86e9b2de5da94724bd3d2d
font_02_sfnt_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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