Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9416a96fdf30bc8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 17:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2ed862a1d6823736b70386a8e9890d4 SHA-1: 35b32778fb01337c02072e9d22ae78a1d28f689d SHA-256: f9416a96fdf30bc838b39702a71094d42dc57ce26ac2179dd0d5b537c01f1533
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also contains numerous external URLs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=123mkv+chal+mera+putt
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/29767901611.pdf
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/zagolitawok.pdf
    • http://controldellaves.com/app/webroot/arxius/file/xagilozuvifuxiga.pdf
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/75643521504.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132bae321752---92406743709.pdf
    • http://everbeenmagnet.com/js/upfiles/files/zaxeguzufa.pdf
    • http://chieucoingason.vn/files/69457926547.pdf
    • https://snoman.mb.ca/ckfinder/userfiles/files/tolevitamagesuna.pdf
    • http://coiffurenais.com/userfiles/file/91613101823.pdf
    • https://service-panev.com/userfiles/96553125188.pdf
    • https://sdhouse.info/ckfinder/userfiles/files/67145968919.pdf
    • http://aeronautike.com/userfiles/file/86541017943.pdf
    • http://gurukripapublicschool.com/userfiles/file/gulinexejigoxurefuwij.pdf
    • http://szyoujin.com/UploadFile/file/20210905050327251.pdf
    • http://ch-bovi.com/upload/files/29101093257.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/wugijakukiw.pdf
    • https://artasedanasingaraja.com/uploadfck/file/45399568014.pdf
    • http://jyczgj.com/UploadFiles/file///2021090612510545.pdf
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/nenusepoxepisixike.pdf
    • http://157.230.241.115/image/upload/File/romitudiwekomurosotun.pdf
    • https://tectrongim.com/uploads/files/80441600660.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210903_022223.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ba02237c---29816466664.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049d71780d---wusedisagomug.pdf
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/movitopap.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_off0000b2d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 16792 bytes
font_01_sfnt_off0000cae7.bin
c85b4989eef179df1c0a96fdf27a4e7a567fbab23629bd3f8dcfaa93461bd5bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE7 10660 bytes
font_02_sfnt_off0000e36a.bin
fccfa61857c1d193310d3815173afd5135fccc025d33773fc78fd2732e2e7b05
pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 16576 bytes