Malicious PDF — malware analysis report

Static analysis result for SHA-256 48cdb9e84b255a86…

MALICIOUS

PDF

72.4 KB Created: 2021-06-30 09:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7a27550348e6201ee1a8238b71771966 SHA-1: 275deb3a13997ec3863ecc02444613d12963c141 SHA-256: 48cdb9e84b255a861f9ea029e6bf0d3200f1a44834b2ebba12234bc8bae690d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=meaning+and+types+of+community PDF link annotation
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/fcb02766e4798701ad98f1ad766e4981/78091220987.pdfIn PDF document text
    • http://rc-modeller.se/images/file///walotodujuresejim.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/9ffef1cdad48f605605647dda482e662/48721735930.pdfIn PDF document text
    • https://kildevangen.dk/files/56317358370.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/sajomurolete.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/3083434926.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/fanikezogofida.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788b561e17d---zinikemimajabija.pdfIn PDF document text
    • http://cutskytools.com/d/files/19299112887.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/54b15bfed5474b7952a0b0bb7995904f/jarikafavapen.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/redusapa.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/xasiroxuj.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/24819562797.pdfIn PDF document text
    • http://ausafe.net/images/art/files/10769242591.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/kedebevemoluse.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/kokokosokunasaxaz.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/s4ffmhj3lbddarjjksooivv182/guzarikukod.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/b5c323401c721e031780664010a8bfa7/56976262023.pdfIn PDF document text
    • https://laser123.com/geektic/files/44725000767.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/17608532286.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/bubojo.pdfIn PDF document text
    • http://seamacros.com/upload/file/wanam.pdfIn PDF document text
    • 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_off0000b9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E5 11024 bytes
SHA-256: f6109e98b24382614d63fe6145f55fa73a92c930b348862b7a160c2b707e5e17
font_02_sfnt_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 16152 bytes
SHA-256: b1c196a9b5c5f40da86c4af6051463337865420fc01f59a843f32328a292b0ee