Malicious PDF — malware analysis report

Static analysis result for SHA-256 a321fafd42269e1c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 07:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93f080f1ebf8b685b562b74e207e5b45 SHA-1: 4b8e70f2f928db4bce9e9de340c52b2051b5256b SHA-256: a321fafd42269e1c36eaa44b71a61246b357185dd76aa3b257b4509574c9e89e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this is a link farm designed to redirect users, with a high ML score and ClamAV detection confirming malicious intent. The primary goal appears to be phishing or distributing further malware by luring users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=install+chrome+os+on+linux+mint PDF link annotation
    • https://gangnampools.com/contents/files/disegikuvaver.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///22750073431.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/wenejur.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/95087399868.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pebazefutilubaxogid.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/23905171137.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/22817981117.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/44669524132.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/tenurirudimaxedu.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/kefijobuvul.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/34820184274.pdfIn PDF document text
    • http://blueparadise.pl/userfiles/file/lilop.pdfIn PDF document text
    • https://projetovm.com/uploads/files/takepegubikuwada.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613671f910d0b---93556110483.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/68390639559.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/90866590744.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead09dc94b---wunogodotolejozozenabiz.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/wurarabogit.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/kisovijexufuwupepevi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161387be258a47---potovasa.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bc1bb4a43---7062368972.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/80625485450.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-13/20210913163249934686.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/25617415019.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_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 10648 bytes
SHA-256: 8c19b3d9b2ad6fab40f0fcf42159accadc9bffa5dc1e6d189ba7c7b5794d2964
font_02_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 17356 bytes
SHA-256: 59e0f94275460532f7f881071d9d8ec83b22347f1c7b2aa83a4bb7272fc01c80

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