Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16d75ed2d8a63df…

MALICIOUS

PDF

87.6 KB Created: 2021-09-05 13:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4dfe6acd3a92bd3d31a0d2db2150386 SHA-1: 20c982a77b67baae1a8c4d4c4273d69e0fa48997 SHA-256: c16d75ed2d8a63dfff20dacd24987d86828f6d6d30f5cb27ad87b7644bc26cdb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of external links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://upbfassadenbau.com/upload/file/wilibozi.pdf In PDF document text
    • http://huile-de-nigelle.info/userfiles/file/58958911743.pdfIn PDF document text
    • http://s-box.eu/upload/datoteke/lazajekirugozoloxodapekag.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/44023174861.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/bugubavezapezezize.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/tg5ne4kuf1pnob5g5n49pu2s85/bevirukaterotonabiwuvoxe.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/41463886367.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/47200b65e1621d0da1a37745d0bc0200/25426292392.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/14040522905.pdfIn PDF document text
    • http://lblussana.it/images/file/xoletulikabimalevonofos.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/11384134494.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/ralugibujug.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d12d22aee146b8a6058bdf886b07464/ruperejeb.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddae60221ea---78495638905.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/10914393227.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/76274420599.pdfIn PDF document text
    • http://chapelguild.com/images/usr/77867562862.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdff68b420---pivozatunerawe.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8ed12eb49---9720959291.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1b6272473b86b571e2758dcde90eafb5/jozekipanofiresile.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mqv3jhf2amqvr5gc5od6a3dlt9/33051164487.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043428f2698---deroriwejuxapan.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/65484721492.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/60584548114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=basketball+conditioning+program+pdfPDF 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_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 11248 bytes
SHA-256: 268c252112169f988489d2a7f92d2c0abc20bcddca5cfbbe6e1cce06387ea1ec
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 18768 bytes
SHA-256: 0d46ddc7462ce547348488282e40c64529bed13d4a560a2ab5323ebf09fc1d2d
font_02_sfnt_off000138f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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