Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6c49cdbc897cc9…

MALICIOUS

PDF

83.1 KB Created: 2021-06-19 16:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0114a99ee96795aec3d962e8c525a14d SHA-1: 64036905d6d6b638e305d099d7820ee70181346f SHA-256: 6d6c49cdbc897cc983d027c308014f40355bbf97966642e59e6cf3c17a6b275e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/gfd47nefejbos07gfqnjr0golt/tesulobabud.pdf In PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/589b866a9bf3612acf2cb79f87a37228/zilopofatolobifozakugonos.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/dupufixilowavoluxijofu.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/68850420828.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/guletika.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb917a95d---51125051202.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/vawezotebudinisebuzamona.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/jfkbckt57q8n99jo1t5ukbbqp3/tobisisufevifu.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/27107358363.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/70569355111.pdfIn PDF document text
    • https://mfdesign.hu/files/file/figorixib.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609420ad5c553---ribovurevukarerixu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5be0cbca---fafizijajitonuriwese.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/66622807482.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qkauon0du6g06pp6dmd2i5a32b/zediwenajokixunimeg.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/fb549d06f7247c28e1e3df872d40006e/49742350254.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607be50c44166---retesobubaruvoreniduf.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776bfb1f6e3---32373792297.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/jalugukotefe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ragnarok+mobile+sniperPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 5348 bytes
SHA-256: 2b4b7f8219f031a958d78e509421887c53dd38c42dc60e6f53e20bf791daab6b
font_01_sfnt_off00011877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 11672 bytes
SHA-256: 422e9308e3efbdca722a734f52532532c06e24a156c3ecfa2dcdc2ed1ab84304