Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9dff3a085c96f7a…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 12:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 23d2b4dc5b6427204629436e0231b0ee SHA-1: c9d77b1a0cd0e50c7737c77f7b33c2bf861c257c SHA-256: d9dff3a085c96f7a24f4652d75aabae27a543414a7642defd5ff219a20b6a4e2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=vadakkumnathan+songs+mp3+free+download PDF link annotation
    • http://adance0112.com/upfile/editor/file/pixube.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/76107633274.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/42618539670.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/71697465632.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mqgp4e8hhs7030e8iu4sorqso3/winesaxadetipuwu.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/lafuzitasuzuwodosubepep.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/41895447161.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/nasez.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lufafutatixigijamum.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/nepunopanujelugasepuvabox.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/2950868213.pdfIn PDF document text
    • http://geoman.cz/data/file/34904618793.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/14489673520.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/towusevel.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/babekukevup.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/pijeselafetutuzoganarom.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/18022747852.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/gokab.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/xekanotimiwafosasufikoka.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/bc0ede30baf17e6ad82cb3673c330ae6/bisaroxunegog.pdfIn PDF document text
    • http://husplaza.hu/editor_up/43513343243.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210919_030046.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f8d76bb84---fomeledit.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/23932404604.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_off0000b35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35B 11272 bytes
SHA-256: e1de2a5a25c1a2885f3c9838e05c7ae725b95cbe70c62a4a4d3037cf9deccb66
font_01_sfnt_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 15600 bytes
SHA-256: 4e3f10d592550ac758e79c60fc090effaefb3f42e3a89fe578f4e94cd316749c
font_02_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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