Malicious PDF — malware analysis report

Static analysis result for SHA-256 116afcfd198e9966…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 02:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7e92668b6f9917c53e8460bb47c4e90 SHA-1: 0fef61bc665af5cf5b11a735f019485879d03809 SHA-256: 116afcfd198e996673019c1632792504f23410e65e1f62844d203ca08f48ec58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also includes numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=how+to+make+a+video+your+lock+screen+iphone+11
    • https://bahia-group.com/ckfinder/userfiles/files/powufoletelawerugafejaw.pdf
    • https://trsoftyazilim.com/genelresimler/file/71469870189.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06e32ef61---44188544888.pdf
    • http://nationalherbo.com/userfiles/file/rimofutuxoruxab.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/52705769789.pdf
    • https://er-cardiff.com/eurostyl/photos/file/37174890771.pdf
    • http://tns-china.cn/editor_upload_image/file/kenetujelenuzunawe.pdf
    • https://e-motorcycle.tw/upload/emotorcycle/files/24574196903.pdf
    • https://fasleh.net/Files/files/rawedutofe.pdf
    • http://jtipartner.com/ckfinder/userfiles/files/44415683706.pdf
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/63877798546.pdf
    • http://eszixv.hu/ckfinder/userfiles/files/zezagerozimuloxemeb.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348b509975c---retinexa.pdf
    • http://hb-hospital.com/file_upload/fck_upfile/file/93744310324.pdf
    • http://gotoippc.com/ckfinder/userfiles/files/87285321332.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137afdf46632---xanizinuko.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135b05895707---10412614125.pdf
    • https://shen-su.eu/gfx/userfiles/files/wulibosimituzal.pdf
    • https://fallsplat.se/bildbank/file/4772772685.pdf
    • http://caratow.nl/userfiles/file/kebusawolesubagiwupexunir.pdf
    • http://hitelesen.com/userfiles/file/56963693499.pdf
    • https://daotaolaixesontay.com/uploads/file/lutizadosevegofatokumol.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe30be8792---79059710575.pdf
    • http://netdepphunu.vn/images/userfiles/file/12062167919.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_off0000d6f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 16792 bytes
font_01_sfnt_off0000ef03.bin
91d4866061582d2a5b21ba805c69f473b55e30cadbf1d63ad926d9b664c8a028
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 18268 bytes
font_02_sfnt_off00011dec.bin
a4532a8160490be300543931083a566e9d5419cbf685a2b0a327d53611abb17c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 11280 bytes