Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb50f3aaa4737c6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 19:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 384449905795595b981fb123f3f801c6 SHA-1: b4a805f63e0dbaa526f67069a364ec26b6013e3b SHA-256: 2cb50f3aaa4737c6e2fbedb5b44d96da8d4603e5081995ae62bba6d38945df1d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to disposable hosting or compromised CMS upload storage, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://consorzio-csa.it/userfiles/files/26845588408.pdf In PDF document text
    • https://snapstudios.ca/userfiles/file/20122385020.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210911_3B73A7FA97B517AF.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/39551916389.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/37241025904.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rifalofurunetilixafije.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/kopaniguwamuguxuv.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/nalawisiva.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a7a13735---xaxukanawapuxuzajawoweno.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/sobadejemomababipem.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc875285b1---17733136792.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/43514347233.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/59919869243.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/magusenuwo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614232f93a34c---xawovekepureno.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/gexakelunu.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/nekazizuli.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/52029501780.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140457655ed8---20892005552.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/27616492652.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/weviwofodosirodud.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/xulezem.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/59690376d83399c8496628f10f2ef244/1207552926.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/73636339766.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/gutetegasezawa.pdfIn PDF document text
    • https://cardolf.ro/files/nujugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=new+breed+drum+book+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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 10384 bytes
SHA-256: 73309fccf17a72f05c1e894f91e9a92e4aa5e9193b298f3bda3b7afabda52120
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 17588 bytes
SHA-256: c829e310471573bc11b00450bc4577427074333c146b798ba35c3c5d3300cb30
font_02_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1