Malicious PDF — malware analysis report

Static analysis result for SHA-256 04253b8dca2dea24…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 01:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8421d52c8e39e05b9dd94d3cfb19aa16 SHA-1: ee69f0c50c3e361143486534fd9b0d50ced6bf78 SHA-256: 04253b8dca2dea245659141df977f223b9d73ec35d16169178cf380fe559d604
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document functions as a link farm, containing numerous embedded URLs that redirect to potentially compromised websites. The presence of external URIs and link farm heuristics strongly suggests the intent is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=the+100+season+7+episode+16+online PDF link annotation
    • https://eletvital.hu/uploads/files/zujibovalupex.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1eb6a9942---99711315850.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a241b05e9717b378cca6a48b988a4b1e/38511135319.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/58203559610.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/55735579599.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/33427819570.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/domakonem.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/33707711374.pdfIn PDF document text
    • https://x-software.cz/data/file/62666656994.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/laxumovutina.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6c95e15e9---dubezofinojexajerulo.pdfIn PDF document text
    • http://innotack.com/userfiles/file/febabolunenerer.pdfIn PDF document text
    • http://hanifeugur.com/image/files/91627561462.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/bidajena.pdfIn PDF document text
    • http://laserinnsbruck.com/static/voveg.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/8152203934.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/bokudewasuzopi.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/5549542075.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/gidemegixe.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/71025767825.pdfIn PDF document text
    • http://apvn.info/userfiles/file/zuvesagukijifu.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/zuvogiwiki.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_off0000d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 17336 bytes
SHA-256: 8931edb59d05961a02abf04dd300e72466c6f2e107e23d40889aec54354bfa6d
font_01_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001174a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 10644 bytes
SHA-256: 7796368cba4db292916e5fa3e288e7f519e1238d413a046887425d67582c1edb