Malicious PDF — malware analysis report

Static analysis result for SHA-256 323bc1634fe9058d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 11:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ffefdc7d80ea44061b31d0542ce7187 SHA-1: 09c9c7c5fafea5452e7241477f799339e58dc460 SHA-256: 323bc1634fe9058d0382ec206f9fd050de94ee86f8abd30a20f84f23381f85f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on disposable or compromised CMS platforms. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mcdanielz.eu/files/file/rozobimomelopuzedosetavi.pdf In PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/d3sqo7v6f2cri4jdksurseggt0/xafirumajel.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/gojuxizexuru.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/101b636ac68d96ce88b16816f163413b/valobusefojo.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/bewopamanosa.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/21564131871.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/wivifivumoloje.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/fupefedovujapizufefemew.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/20375081053.pdfIn PDF document text
    • http://usagimatur.com/files/others/66916913744.pdfIn PDF document text
    • http://leguido.net/files/nagebekinojukep.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/bujawelabuxutite.pdfIn PDF document text
    • https://securitydm.com/slicice/file/fiweta.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840b753e146---nuwipovunubetaperu.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/82313013317.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/foluz.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d16ad35c6---91894526326.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/31720251301.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/nakulo.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210529_AD75B6C555DE428B.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/15659358837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=embedded+system+software+architecture+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_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 11160 bytes
SHA-256: bac2d6da001204bc474f40d51c3487daf08af44815c69d2c9f8fda176b5ef6ee
font_02_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 17148 bytes
SHA-256: 88cc9a6a120811300c038956542e5aff07b9fb8802b424dec0b17fc7b6b9779d