Malicious PDF — malware analysis report

Static analysis result for SHA-256 c749f1ee7b4fc316…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 09:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9042df724a9682f51731483e818afd8 SHA-1: 79f9a05d32b899ab6373936939beb69a9abc61d3 SHA-256: c749f1ee7b4fc3162b74511f3f98fb4fcc8e33181300e7f5edf64ef6043dd992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary indicators are the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://culfordequestriancentre.org/UserFiles/file/punal.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b1a2700951566ccc56135df2b039ba4a/xemaripemunemo.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/24804907851.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/pilenabawiwiporazoxevumog.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/73896b3c04190d923f2358e186a934e5/77549023495.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/punelebalopesilebakukowe.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/77160097669.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/lukawomufabegom.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/naxivogevokusewijati.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/84286923316.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16143e60a871e9---23701031286.pdfIn PDF document text
    • http://zeci.nl/im/image/subawupelapotubagujojox.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/xuzamudofesikojuloma.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4aa41d779ec1fc243932f55350a1ca2a/48680103639.pdfIn PDF document text
    • http://thevalleytrader.com/files/54068521274.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/goxudofilomake.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bef06c09b3---52159318332.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/52328017207.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/69957721309.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143df4a6c7aa---vonanepunafotevewilus.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/fubasesebejalolaloraza.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/79481480184.pdfIn PDF document text
    • http://aven.su/userfiles/file/depukekozurarigabufako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+free+mods+for+minecraft+pePDF 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_off0000b34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 15156 bytes
SHA-256: 147b62c6d089b9f1870f773cff61f2c333e5c6e86d66c875d5f7150469dc91e9
font_01_sfnt_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 10788 bytes
SHA-256: e8055c196d9fbeafadd2698669d7fa8544d3d4017c6f2e432e510181226f5f06

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