Malicious PDF — malware analysis report

Static analysis result for SHA-256 53390e6e532c54ac…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 10:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b663c78a37a16115c1dec7816bc1bd3 SHA-1: 2296aa9f982211f443dd5e656296a985767db220 SHA-256: 53390e6e532c54acc1edac6282392d2d456489ad6a15b29f992b97f566910d89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=used+sprint+cell+phones+no+contract PDF link annotation
    • http://globalbizkorea.com/userData/board/file/565642440.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/71795151237.pdfIn PDF document text
    • https://webhosting4.net/media/file/45652842148.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/83303408863.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a388f3d2de---59036702728.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/59602294871.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/nafiz.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/tafuduxemuxigogumag.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/sovupinerane.pdfIn PDF document text
    • http://koala-al.com/d/files/panipemutujodaxasuneje.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/nekunokalujon.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/85615278694.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/81286191929.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/8571966928.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/safojibexete.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/nazujuvul.pdfIn PDF document text
    • http://newmob.it/userfiles/files/46947444828.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16138df8842739---60733576245.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/firepijogigavunepotoga.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/69888176714.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/kotida.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9230c8b8---pumow.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_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 10620 bytes
SHA-256: 002dcf2591a058e4bcbe66a953bb53077215720ff2373264521a7e10e48d82ca
font_02_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 17816 bytes
SHA-256: 360df698be9bfa7412d31b6d23e5df02c9d6abd6753d70cb3e25df46bc3f608f