Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fc067a8a9849d8…

MALICIOUS

PDF

90.8 KB Created: 2021-07-05 11:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ab36a782fad6c79b7cde5b6b014f1803 SHA-1: 6d194b93633818ff00d326e692f945f5c253a2fe SHA-256: a4fc067a8a9849d8f7c4cfc10d3f8feeb4c4f5a0aa97126903b5cbbb6775f6cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a link farm leveraging compromised upload storage, suggesting the PDF is designed to redirect users to malicious content hosted on these sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=data+structure+pdf+notes PDF link annotation
    • http://solarhomepage.ch/fckeditor/editor/images/file/rulufasagazafaje.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/gusan.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5373ac17e---jipikefefavafoxilusizup.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebdc879d09---darad.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f7da852fbd76478325b9263664115e6f/5027415067.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160892a6aabdc9---lidalisajavifepisud.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2ef36cb4dde0ee5b1ae77ca08013b23d/xafesij.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8c249b749---15854798088.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e368c0dfd83fdb355f5f604a11d2df11/jukojuje.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609412de1ad57---21360027038.pdfIn PDF document text
    • https://mfdesign.hu/files/file/jutudopodiginuziwowanufa.pdfIn PDF document text
    • http://citra.cl/userfiles/file/92286706180.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/413cbb0d85130aa4f7e1039b3abab580/81358346017.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/sivap.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/90325986002.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/6rqar3o15820s5k0aq5ho7ti99/welobixizujukep.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/63504254525.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad5c1432b5---88323688473.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kubipexamagawizise.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/48127966813.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1311b849---82086178295.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed4f5d21cd---wasofofiguperubor.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/2f7e3ah56bf928u5gkc4f9si87/52374183540.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee6a167798---kisabemojibar.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 10576 bytes
SHA-256: b49dc1b95e950ecff68eac66ed20d526a3d0d0dcd91b583a9b03b0c529087992
font_02_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee
font_03_sfnt_off00012faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAF 17356 bytes
SHA-256: 1307a50db7a58fac8cc1a5a936c45dbacaf042bcee3098166637330ef8c69179

Open this report in the interactive analyzer, or submit your own file for analysis.