Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e15b6adb5a1f7c…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 13:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6b77837efaad384b80d98fcd0c401bd0 SHA-1: 1814fca4a586e8e35866325e51bece4418c4e3d2 SHA-256: 57e15b6adb5a1f7c19b1e3fbd208e949a84d3f7352e221722967c6847d2e1678
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85593b11d2---zelaborakarixina.pdf In PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/lk26gl9l2as46qecveiics3b13/27478972498.pdfIn PDF document text
    • http://cloverdiamond.com/file/wasobesikuxatapunes.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/xupidafefarumuzoferilera.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/24011494808.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853f5fa81d6---vufabulujipi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b1ccc0c2---vovusugerupoteb.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/f8hk2k8j3fe501sc79sg0aehj1/29189219923.pdfIn PDF document text
    • https://bamor.org/userfiles/file/reronopatarowugesefodutex.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/h585c7ip417scqq1fn7pbrlft9/gozuromi.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/44322620479.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/52731048586.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/gefijebalexipexuretariza.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/xirazidafave.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160896552e142b---fonowulinenoto.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/15093325081.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/nijezemeganeve.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e35c07c00b---diwagebalirikizudiz.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/36799664716.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/91349296132.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d68fbc0a186---wogotipasep.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe084b76c---68727388706.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/mowulumez.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2d5751d175951973d1dda72ff59b5f23/15513869723.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d7b3b7d2---toromenuzux.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/37093021773.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc3765f7cf---97065721361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+plucking+eyebrowsPDF 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_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 11176 bytes
SHA-256: 378b6a12f1827fb291e137f627e08aadcdbad4bb35669362cb45912b24099b95
font_01_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E27 17444 bytes
SHA-256: d7943158e3fb460118537508b18131d8b86304e294836eab0693b16ed99b2f64