Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f7669b95a00731…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 13:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d0c6c261327eef50788ba68a0971c88 SHA-1: b557411373af189e11960aeb0433f3303c61dc8d SHA-256: 90f7669b95a00731ec2b62044366521b3410776982d95ae4b0b6bc6fc5c07ee4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://hostingureitings.lv/uploads/userfiles/files/72595164043.pdf In PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/5e6ff1982ba2f12dcb9adfcddaed151c/januja.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/84468081967.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///tukatalevatobalefuwizek.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/24199757289.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/35054668780.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/dinetatixijotop.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/14119128506.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/jurusug.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/36553188955.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145f22dc8a6a---golitipomefepixiwosonad.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/damurif.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/varanikoxemizidopabemiti.pdfIn PDF document text
    • https://rais.bg/uploads/file/77224897417.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/kegazululilofomafetide.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/zobukusiku.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/93042733421.pdfIn PDF document text
    • https://kawanmto.info/contents/files/pogewonoxaxadanidonagub.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/515b41ad7f0ec3618fb967ae99f6f1d0/7122504178.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/24477474558.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/50325760434.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/95982999473.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/moravokilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=thor+ragnarok+movie+watch+onlinePDF 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_off0000aeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAE 10716 bytes
SHA-256: e16dc1fed255e76691354327e743f55347efeeb1a8a0cd62a6ff45dabcfda5ff
font_01_sfnt_off0000c72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 16124 bytes
SHA-256: dd03e765b1d68df04e07e86e9e6ed575066f0e32be079ed2ac792968c2807f86
font_02_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1