Malicious PDF — malware analysis report

Static analysis result for SHA-256 840119533dbad968…

MALICIOUS

PDF

91.6 KB Created: 2021-08-12 01:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20026c131c8b18a21ff15b9fac43c8c4 SHA-1: 6133f6b6eb9cb65b6985f4239a779ed995ce1224 SHA-256: 840119533dbad968cad4e113d84369cdbc4fb8cc02f3e96877d52e3f6c3a771b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for malicious PDFs. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host or redirect to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://murito.fr/ckfinder/userfiles/files/21362634674.pdf In PDF document text
    • http://duszek-lasu.pl/userfiles/file/48766017812.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/fezopi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160df28ba4d3eb---zuwibujej.pdfIn PDF document text
    • https://fiordipannacremeria.it/file/52494961043.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/92819018418.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/xexaxurulebafuzomagurem.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609001d19ffbe---97481625414.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a92adcfa1---82985089764.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/fugumaku.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2ab65503e---zetizi.pdfIn PDF document text
    • http://lucann.com/Upload/file/97028451204.pdfIn PDF document text
    • http://lucann.com/Upload/file/41829606854.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1ac1b130e087dd5117da5d7350d8e443/57021019159.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/35094232604.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729bb0d1e6c---85188668351.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/67128754254.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/5166768153.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/wejakuvikifotu.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/48479766371.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/22256054492.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868b9735a42---rikomotoxivulejowaxakeza.pdfIn PDF document text
    • http://liyangah.com/Upload/file/ruledaxiradaxogidi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b117005113---faxebasodugifarapole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cuanto+equivale+150+gr+de+harina+en+tazasPDF 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_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 11240 bytes
SHA-256: 61aebdcadc16bcb7d65e472ab99f846906e9f87b9e91204ba3f7978968fb6851
font_01_sfnt_off0001175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 18708 bytes
SHA-256: fad3378d982134b12c9a5c0f17d53f30e206ba58792e847bd980a04373cca268
font_02_sfnt_off000146a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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