Malicious PDF — malware analysis report

Static analysis result for SHA-256 7593c2e93581d9ac…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 02:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c425a1bb52302a96f2659c8608d2605c SHA-1: 1096fc28baa3e24a96a90c9ae271e62417cd3ecb SHA-256: 7593c2e93581d9ac99f83a748443a636831807ddf968e4e3d4599497c2dd239a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded links suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://syntrend.critical.tw/upload/files/tupuxitu.pdf In PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a8093c7a5b9e4cb99bfebb2e9537f728/mirasutebufugawugulowutu.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021091105265673499.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/37101415462.pdfIn PDF document text
    • http://alltechsro.cz/files/82362807615.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/76962899455.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/jowisoneruporufol.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/vizitozajunipekozefexoru.pdfIn PDF document text
    • http://pbpharm.com/upload/files/81539864443.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/94539426840.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/41282665124.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/gefekupuneso.pdfIn PDF document text
    • http://stl-hk.net/userfiles/62989026876.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/lckn0g4b35bjao9ov5f9a306v2/faginiwet.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109020553592596.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/20781484245.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161378f5eeac76---loviwovezi.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/86636852176.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/94850190374.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/palonapivazarezu.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/wixaj.pdfIn PDF document text
    • http://enricobarraco.com/files/dobijokivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gold+advanced+coursebook+answer+keyPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB999 23052 bytes
SHA-256: 90f9fe98cedad9c8eb6c5aab03316ffbf2c2f03387f8bb96d3702a871aa7aa6b
font_01_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 1776 bytes
SHA-256: 5df3691c8e7c4cbc28bd9a15813b86c32f5266304be0e6eca3494cebcd22c3f2
font_03_sfnt_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 10812 bytes
SHA-256: eb3d9b792efac798ac0cd2dded70938c1124596216ad47414205e51c93adad42
font_04_sfnt_off00012de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE5 16704 bytes
SHA-256: 8a73337437b1f977edc89a6aa4e1a1fcdb2c4b12d476670afd5e163eec23aa6e

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