Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0a9496a18a89b6…

MALICIOUS

PDF

80.0 KB Created: 2021-08-04 18:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e70b1ef206041367c944acd855a2b4e SHA-1: d9961984f0dac6035f2881d0332d8ed5f04f32ec SHA-256: 8b0a9496a18a89b6479db16efdcb9d4940cd68916cb97f0be7a1b04c9bca368b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised websites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded links suggest it is designed to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lasfyy.com/uploadfile/file/20210709070614923.pdf In PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/48423565428.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/birenivi.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/pevew.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/84018958232.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nigegufituxe.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/80520139723.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161031568a3b54---3939078091.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/6843588972.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/21729631042.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c6ab20d72---5191335094.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/57579316319.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/sidemero.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d199301ca---lunerejifixoden.pdfIn PDF document text
    • http://portableandcool.com/files/files/zajuvosiz.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076a79cb3ab2---tejojivadu.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/79300004637.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098921308298---jasubesixunemoruz.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/38371812012.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/latagegivuvuzalar.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a840236af5bf7460ffa83a29271a297e/tomaxuregigoxekomiwulu.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/seruf.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/pabosudijirolixij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=direct+and+indirect+rules+in+hindiPDF 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_off0000d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 16520 bytes
SHA-256: 140698cc57f4b52d5269603a33c709d8b88b82a67ef228142018dfa1d80dcb49
font_01_sfnt_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 10448 bytes
SHA-256: 55d42970fdf4aabad31fe4c0fe7d9a97c04c19b9f7e2a116019eee7b38c5b26b
font_02_sfnt_off0001178c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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