Malicious PDF — malware analysis report

Static analysis result for SHA-256 719e16336214df8a…

MALICIOUS

PDF

85.8 KB Created: 2021-08-19 18:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4d1d4693d57fc55f9f2aa9b5d10317e SHA-1: 24b86eb787d0ce376ace1c76ad54ea5b1d1a6aac SHA-256: 719e16336214df8a1e157aa94626196a46374da97385efc1b48968977c51e0a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://worldnaturalfood.com/image/upload/File/nebel.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767caaf2bb2---damupupopaponitawunijugij.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/2203852703.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/wiletibajekufex.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084da0474325---69606600282.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/kidukobow.pdfIn PDF document text
    • http://chapelguild.com/images/usr/79074504397.pdfIn PDF document text
    • https://cubic.is/userfiles/file/40028312100.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/1961234557.pdfIn PDF document text
    • http://www.bash.cl/media/file/sevepuzefudiworuberivumut.pdfIn PDF document text
    • http://web68s.com/upload/files/52248338150.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c9d9d168---35991110695.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/6993ed138c6781f7d854c15771677c20/24741414356.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/ximokuzilazojabewa.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/55775197660.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/p7th7rcf1ppv85s2bmk0lhi0nr/54877868527.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/nobadesuronerovelovezo.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/6711032914.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/xamalozobesafuwavasu.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/93894934903.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210819102501880954gtwmh0.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/64a61d5a92aede78eeb01c6db32561f1/sutewatadobiwepanu.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/30801506926.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0dc67390---tuzawelaxaw.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/kamub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pubg+mobile+hack+mod+apk+dataPDF 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_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 10924 bytes
SHA-256: f4ff586a21e67da23fd810cf85e7eda308e9c3332b5efb2fbe31afc039e5aab4
font_02_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 17616 bytes
SHA-256: d4186e1c493476c23b01ef52008e2542f6df12e9d85e8017146c7c4d1d70e37b