Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ca3f822b371aae…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 05:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e0273aa985e3bfc4e30e06a260f3467b SHA-1: 853e0b237070e5f1ea6156ee2a62394368323425 SHA-256: 33ca3f822b371aae0a698c43b76dc833f2390ea2e35c14b1744a542b61f926b3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://bititechnika.com/uploads/file/67261489102.pdf In PDF document text
    • http://mindatpeace.us/uploads/files/76615818429.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/21515875087.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/77988612833.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/36959220121.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/soteragubiwigexokezus.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16094774c9304a---kesoratuvuzifowel.pdfIn PDF document text
    • http://compsult.net/userfiles/file/nuranenutufakekufuzoki.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2235326e8915fbd179d52e40eeb19976/49943712514.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/gulizos.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c7ec311f---27969713161.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/20522279841.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/95768518936.pdfIn PDF document text
    • http://chpcentre.com/files/file/binelokubusijozovosu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d6534c96---71283284413.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/xefiguz.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/r0su5ncmujovjhldofpcjk1u6t/96745041356.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/jataxusivuzedag.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/mewujewobiwi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c5ue04c4v2581ohdsvqev02lfc/wiredemifomidufin.pdfIn PDF document text
    • http://simonide.org/userfiles/file/jufukavupiba.pdfIn PDF document text
    • http://fygl.net/uploads/file/10163534450.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608041a46d7f5---dumadobasiwize.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91451c0967---malarinotebudovuwat.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091ddf420a21---jagidudilob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=i+love+pdf+merge+pdfsPDF 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_off0000d3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 18168 bytes
SHA-256: dec235dd721aa67028c0481f0242f7b86b2d0595eddee930ce12a16426d2246e
font_01_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 10404 bytes
SHA-256: 42ae8d8109e0375b7c2b79e02ff15458e60166ac9a4a80e3c6f82a2d5f0439c4
font_02_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1