Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b746b1afb4b18a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 02:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c563b721d0a2fa1999e547747de057d SHA-1: 22092b12d2308eaaddbc54f7963feaca2840c9e9 SHA-256: f8b746b1afb4b18a242869e5c5b896a310e1e764d584c1f40ccf1a94ba15a892
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://sherwoodchamber.org/ckfinder/userfiles/files/29024554323.pdf In PDF document text
    • http://p-itos.net/admin/userfile/image/file/51676939142.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219111853208629.pdfIn PDF document text
    • http://abwva.com/uploads/files/98773249555.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/vutetorelewikumitujefuf.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/wuzubivomolesosove.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/surolaragegexisa.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/vopabalaxetirupuwaxaza.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/67652655474.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v2pmvhjqabhk731v9valslm3p3/kupexeloton.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/fevigowu.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/53500368723.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330d10b8314---xezuwosemalin.pdfIn PDF document text
    • https://posh.hr/files/bonukuxokadudakaxi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0c08793e84b249f2614a12ffde4edb00/54324984102.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/1343264176.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/xiwaluzabefit.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61664746144.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/28768854446.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/86704533255.pdfIn PDF document text
    • http://toroisg.com/public/images/files/48211322417.pdfIn PDF document text
    • https://schmitz.cz/res/file/jugopuriwufafezi.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/vajawepi.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/3896849100.pdfIn PDF document text
    • http://poultech.net/d/files/jiwirabirabulazemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=storify+tv+series+downloadPDF 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_off0000ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 16704 bytes
SHA-256: 2287e86c50d53d0ede1bad632b6743d4b97d3f96b751d39989d2fb5db373aaa2
font_02_sfnt_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 10688 bytes
SHA-256: c755b62b22192f8826398d3575a53af21a7e6eaca8edab7eaee4e91f24208e22