Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca500a45d63160ad…

MALICIOUS

PDF

96.5 KB Created: 2021-10-10 18:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1e85c3e7097c2d4d0c05bfa8d692897a SHA-1: 960c7d3e57b299af19b20c6a7abf9dac65e3405d SHA-256: ca500a45d63160ad6d023e1f44f5f720c84d180ff739a05263a3a9438f9d5e29
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the document is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lambanghieuquangcaogiare.net/vietkiendo/upload/file/debovuvan.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16153d4bf37b25---32072794196.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/xadigog.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/64757870673.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/loxavivigetefibi.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/92562008711.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/guwivuxovujepuboworozuka.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/kakozap.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615f9b06c93ba---85424444014.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/97387418097.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/vozipubanuvitokufabi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d025265bc---38639677110.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/baximexanepuse.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/kelawunexobag.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/vojutu.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/3403625353.pdfIn PDF document text
    • http://aawyx.com/sites/default/imageuser/file/zujeloriri.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161517ecd56781---pawesesokab.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/sunovudotudixelixedav.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/tapepatukobivatuwatupov.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/nekuvepuxi.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/lovifopatusepigimevuner.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/57218216737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mlk+bends+towards+justicePDF 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_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 10904 bytes
SHA-256: 0996288168ac15f5f250006c804f2c8d24e575db9d58c85ef9b16e4cbe417ee9
font_01_sfnt_off00012b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B42 18968 bytes
SHA-256: e3b2835d9dfb21bfe27be93962093f516c8b4f014df5b169dcf2a58f5a8f5cdf
font_02_sfnt_off00015c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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