Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7dc031bd104211…

MALICIOUS

PDF

91.2 KB Created: 2021-07-23 03:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5da765f6202a216e95b6118bee860303 SHA-1: 13e15ecb2d5d34080f2ef98f7bd2a01687521c78 SHA-256: af7dc031bd104211deaa4107daeeb743f75060fc737d835c6f4807c36ce351d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malware or lead users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608577a1d7fab---58548889722.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b95c6b1e9a---gikixokuluti.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dc07f09084ea8e6530de91e72545236e/pagonupoto.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/42470e1c935899b9b4da3a6096b61cae/gukarirelen.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1da43e438---zesamemubuna.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/87001212153.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/18495125876.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa81c16d6a---veroxepiwomefulimuzivevo.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/nadevijatibaxe.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/waruvabupupitobos.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/vcts5avskql0acj95uaqsu276u/gokubafigadetuzaf.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/zekononojapezenos.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee47c86b25f---30428679834.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/66935201041.pdfIn PDF document text
    • http://cartopack.com/Images/file/fubafeb.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/84113207214.pdfIn PDF document text
    • http://effektfilm.de/files/file/nujitubasonulaxi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40522b34f---xomuwigowewif.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/41157547076.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081141debe47---nodusefefekegaz.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60df6e4b7---dolumudexopu.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/bojunamozip.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/81853383137.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/vubaw.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afdfcaf246---69644848091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=barbie+and+the+diamond+castle+full+movie+watch+onlinePDF 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_off0000fe86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 17160 bytes
SHA-256: 6259fbbf55246e85cdde16bee90b2d3335ff7f29a2ba23d267e3093fdf432870
font_01_sfnt_off00012b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14384 11184 bytes
SHA-256: d9195da76c6915f64a625fe2cd013277bcb2029ec486d543640ecda5d902839c