Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4de3a0dcaee43b3…

MALICIOUS

PDF

89.5 KB Created: 2021-07-30 11:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbbff82ed7ffe05019bbf74a87b40542 SHA-1: 0cc464f5e226735de3e835cc72e56362ec4f53a9 SHA-256: b4de3a0dcaee43b377ac3dbbc3f32eb4274910daecb31d0af0605c56dc32cdaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to download further malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb642cf1ee0---71919483691.pdf In PDF document text
    • http://dancedynamicsla.com/clients/38740/File/piwixadetixenowowajapiju.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082c21db6f90---mefukanokugar.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/9h1fd2lhmqpt2n02c4ssua5bv5/gumozejerajetavokiwalov.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///94657849939.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/65f5d48d4482e498f2c372cd27239d29/gotabij.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098719b08675---werazedab.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/93241768378.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c98929db8fb---lekuzowivifefopajebu.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210606060741307.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4qc1hp6802j2d9ostbt5lkkvlf/mutidedawa.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f09f8fc9250---4621021240.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50011976741.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/11arpdmiv1a3k3dvq6f87lk9ja/wosilebib.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/8788572093.pdfIn PDF document text
    • http://chikatere.com/Upload/files/rujotorinigexi.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/xofepugimexu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b2802e204577d386ebd4900e3348d718/buvunaberatubun.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210607085019-ropedixikonigovinuxadovil.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/91cf1b20f69761f0301764c3ca5a24bf/dejejugejabij.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/15536762492.pdfIn PDF document text
    • https://inifd.london/uploads/file/suparipar.pdfIn PDF document text
    • https://maturana.cl/upload/file/befiviworul.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/18928845712.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/db81b1fe917ca649f66ec80bb4fd8095/59849125108.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/nebiposatagifizelif.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/kugefira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=davy+jones+theme+sheet+music+pianoPDF 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_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 10904 bytes
SHA-256: ecb7375a4756f5e3fbc3553f8c7a0358003dd68606d161192ca79631fe1f34f0
font_01_sfnt_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 17644 bytes
SHA-256: 8abbf3c89c0f920cc15d6bde10be087b4bd104467e944b81599b9dd4ebc90d35
font_02_sfnt_off00013f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1