Malicious PDF — malware analysis report

Static analysis result for SHA-256 6989a889a177f89a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 16:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 22cc4d4fc97cb4ea10bb1ca220b1bf5e SHA-1: 2193a6db3e4a790ed159f5b1b040afffea0b90b7 SHA-256: 6989a889a177f89a773904c05a3042481b20f6c0d629f9fb8328fedfc2daedd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=pkt+vpn+pro+apk PDF link annotation
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/bepipowigeragivi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/up8um3haqvgqunpvrsl53uv3u2/xodupoguliwuwojawirawija.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/jitorex.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/17448047980.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/82311416856.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/30724594736.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/xomizeterelanur.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hvrpq8gj6r4odrh1garoti42fm/jafezevibuxusosirotijezi.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/mazasutigasidosevopefupo.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/32611201781.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/parixibipafukizigawigir.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/wufukilefonigek.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/lenute.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109050507049911.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161374c99a1b3f---58175504723.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/32051152350.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/diwuwupokin.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/fagevidifadugitipu.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/55808134367.pdfIn PDF document text
    • http://ge-mak.com/files/56593656384.pdfIn PDF document text
    • https://businesslife.com/content/files/movixepejezikubekulibugaj.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/20522030129.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/91244505221.pdfIn PDF document text
    • 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_off0000c1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 9964 bytes
SHA-256: a3b2da94ad97b52bc91605f6751f4cb69725a495ed4d7486101c4973b972a27d
font_02_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 17024 bytes
SHA-256: 64298dc9d050cb32552013224096dd72a6f613fae5e803fbc2ff966f1554cb21

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