Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8df9ddb1127803…

MALICIOUS

PDF

87.7 KB Created: 2021-09-04 05:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2355f808e2085ffcf0e7d5f9457b28ce SHA-1: ac83bd519c8d41ac2f5827965f18bd3681ff7f2c SHA-256: bf8df9ddb1127803fe5cde92cdb3c1ad25b099889e354461b26cce07ecca91f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://qfuse.it/images/uploaded_files/ckfinder/files/1628375585_1f83137e59.pdf In PDF document text
    • http://dongduong.net/Images_upload/files/mumuzibidatatag.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/dudilosiwifopuxebepibep.pdfIn PDF document text
    • http://186086.com/upload/files/bevozurojamikarite.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/28618340972.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/15686622846.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98734ef89---bisuwozasil.pdfIn PDF document text
    • https://ebooksweb.net/files/file/piwotuxajazodurijaxu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2afaf0c16e---sotinaregexe.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xirupoxefelukafa.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcce624713f---fidikakazikiniwawojog.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/tejutaw.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/xowofijelinuzusajiz.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3aa0f2e6---74096254757.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/bupivobarejo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb80ba70e24---xutawef.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/60793230095.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd27b7436ae---pulutuxalesukanewejofure.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/f7adddt7m1ai0dbg9e9nfk4qv2/18208634859.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/bosonegazed.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/38614619189.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/87252059944.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acae8f12641---ludor.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bef32049abf---3584490177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=intususcepci%C3%B3n+intestinal+pediatria+pdf+2018PDF 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_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 19508 bytes
SHA-256: 01be5f8274b4e4d46bc6afc2b2fa73de4dbad355931abfcc4e53f62f9747dd9e
font_01_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 11184 bytes
SHA-256: 6ae3c8cb328aa1e152027e5639863f7b85ccf5d95dbbceaac73aba57604bcc11
font_02_sfnt_off00013675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.