Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6aae1dfac8dc02…

MALICIOUS

PDF

86.0 KB Created: 2021-07-04 09:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cabf08eee862df30d1db27027dc1f41 SHA-1: d0bf015bc8f7b97baeab8489e688512f30dea46f SHA-256: 4a6aae1dfac8dc0232e0ac80974fb11be4f14fe39451d5e9a36acb1d59e220f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links is a primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://allytemp.ru/uplcv?utm_term=express+purpose+exercise
    • http://leebyunghun.org/new/upload/board/files/panizofejamibukupopad.pdf
    • https://alatheir.com/atheirwsfiles/file/3857655196.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/vr0alv8higbptrpjb9ao52ser5/95015846240.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16076b088bb176---76702653945.pdf
    • https://stdtekstil.com/upload/ckfinder/files/89620928875.pdf
    • http://inannamsao.com/uploads/files/60245655995.pdf
    • http://andrewsexes.org/clients/867461/File/sufudavudozutodumuk.pdf
    • http://altelaw.com/uploads/image/file/48130103464.pdf
    • http://stellamaris.cz/userfiles/womigabefepukazogimimoxor.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/latlkfsk44g06krb7bj7tdglk1/17087503783.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4427a4758d---27751240528.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cadcaa4a85---gurab.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a235945ea---21669927980.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/jidemokiletepekixebenodel.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c523d58a8---27230684972.pdf
    • http://bronia.org/userfiles/file/nafado.pdf
    • http://txextremecarts.com/userfiles/file/supezinowurebugego.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/75961296986.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/53ccde94dd5c7d932c01f61ac5c2132d/sobogakivitipunepu.pdf
    • https://anmimar.com/royal/userfiles/file/luzejisujobavanupizab.pdf
    • http://www.aluvascientific.com/UserFiles/file/toxuwamamarefara.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/8bbe386ce0431828e5b7b576d8d875d8/91196249251.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b109ae429cb---zovumufixus.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0c532997---64732427680.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160da30417b118---gugavodafozadifi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 16792 bytes
font_01_sfnt_off0001037d.bin
ecee00e1db4af2617cf463553b3c2739cf97664932acf23f316fd1ceb840b231
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 18316 bytes
font_02_sfnt_off00013254.bin
7efe2b8541bb119a79340b822a709b4d9cc3912b22d22eae26a9426df441a4c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13254 10144 bytes