Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc1b9515916c026…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 05:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d8b07f5a91aa2484ff4500b5d830706 SHA-1: f8c65062230ba13a76279e27c2b8dd086e919b30 SHA-256: cfc1b9515916c026e4440cd7c67efd785fd645f63ddbd4b41f6e2e87032de9a0
176 Risk Score

Malware Insights

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

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 various external URLs, including one hosted on a raw IP address and others on potentially compromised CMS uploads. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://jaurrieta.net/USERFILES_JAURRIETA/files/41560521489.pdf In PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/bilesonixetezidanekinu.pdfPDF link annotation
    • http://opsir.eu/files/file/43147093114.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/rumotedar.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/nitafezeram.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210907062321_fdefag.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/daminidada.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149026456328---46360869725.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/zelijebugevusofevuwofaku.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/dixuwavitinowinukan.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vapegatimawobewula.pdfIn PDF document text
    • http://ametansk.ru/uploads2/jekasivuwevoba.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/guwurotigokezatopijezob.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/junomewalexetaxetomi.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/8701855622.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/gageto.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/kumipelavezija.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/dejemisixoji.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613793f5c1695---57415704294.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132af24c5d12---sulaliwafisizedovosuvu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613faaa1ad4e2---3203343310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+phone+message+notificationPDF 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_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 11004 bytes
SHA-256: 68c4b8515ac8842221afb701312d2084e65fa6147af15bf713fdfa609e3904bc
font_01_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 18316 bytes
SHA-256: a3c2a11427b177fe4b19875158c2bc20a2a94778e74f8053c59511db7c1cb3e4
font_02_sfnt_off00012a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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