Malicious PDF — malware analysis report

Static analysis result for SHA-256 1027c1c49bc25075…

MALICIOUS

PDF

89.4 KB Created: 2021-08-20 13:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9682139eba476a0e89b3ec23d22981c3 SHA-1: a1614fec75b207362c09973b782946bb76e516cc SHA-256: 1027c1c49bc2507597fb705a70758d90b56acaf86edfc3cb443d543ccc8bdfde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs. Many of these URIs point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b224334f2---kivufuvasebisujeduta.pdf In PDF document text
    • http://aranykoronakft.hu/userfiles/file/65742722564.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7729ff02e4---xidafizatuz.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/wovimidujarapareduson.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5480c91015---bibepidagubezuku.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/jm36e58lqfb6clc006cm96at80/37787684156.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/d1fv08v06q1vofhu0tpfkbqamq/70968002907.pdfIn PDF document text
    • https://t2sc.me/userfiles/20877644506.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/24016267789.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/gipamenepinukovaxota.pdfIn PDF document text
    • http://fotossc.pl/_files/file/kutuvodebofoninetej.pdfIn PDF document text
    • http://healthywithhart.com/res/file/pixojej.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/kexivelodisideged.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/mevifamu.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210811033724.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/resixe.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/90863382988.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/43388510339.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/sljttjvud4c4664c1bj7o84cga/tiloratitemux.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071a926434fd---vorudi.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec3c4a7325---korivovojob.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610c3c63c257e---43056714895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=speaky+premium+apk+free+download+sitePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 16792 bytes
SHA-256: 8ce77828d5ac2421c8dea00605534c24fb022608fd0782fc8ae85767bbb8052e
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 11128 bytes
SHA-256: 958955800ffbeefed832a667d0cc45482cade27bd6994c7d5451dffb8c831a85
font_02_sfnt_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 17332 bytes
SHA-256: 82af7834ccfc3bfbadbfc527217bea56c20d3280b6a6e0063626b7d87dca8bf1
font_03_sfnt_off00013ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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