Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9fe43e5f037ab2…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 12:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 713a64a1db3cc41c7c7d265017688aa8 SHA-1: 973c253b9102888f008fe9136bda242f05f4375b SHA-256: dc9fe43e5f037ab2219118d17826245892515804a94eb83010fc019d42b2bd07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://mimarkamilozkartal.com/userfiles/files/10019320231.pdf In PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/dopez.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/gigirujunotozonikoladag.pdfIn PDF document text
    • http://termocity.by/pics/files/zefejedukulutadop.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/85283097739.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/849a33caf38e3d6554a12be65c292166/wodokasixudazevuva.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/rawatixani.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/80008530442.pdfIn PDF document text
    • https://steammining.com/userfiles/file/zezetojodejalumusudoxo.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091315221896.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/90381023096.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/4204513145.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd774d17f---42226184432.pdfIn PDF document text
    • http://cabini.it/userfiles/files/fopigapepigasutudawivek.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zolapakiwuged.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/fewulitowelexolinuxulibi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614537f011330---bojonan.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3549fb2ce1f93f6601fd447dee2b8125/letimurorepi.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/06c7328467b728b74e270a67bef23a7b/vuxojalesufag.pdfIn PDF document text
    • https://makenie.com/upload/files/fukeralogedebuw.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/68398292544.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219121651241690.pdfIn PDF document text
    • https://birotex.rs/images/files/86245782140.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/vufevam.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/10408775874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=rally+racer+unlocked+mod+apkPDF 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_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 10668 bytes
SHA-256: 0a2ceb90c25376de5704b40cacfa023faa9212d1ffef89d280651469f193c658
font_02_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 17844 bytes
SHA-256: 03c8a362c24771a3ef92550e0be04f232db7495ff637fd4ceefdc4bd95708734