Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7411e9ab47c52a…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 02:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 38228690dfb763fc8bf568ff25f33c10 SHA-1: 1e30457d993ddfaf2882a7711cd1cfda693aa4b4 SHA-256: aa7411e9ab47c52a34f78d7a27668698d2b9ec093cb69f89b1a5e513128eff7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/75027763984.pdf In PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/68787265417.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/jufubikerigedowejotugo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8e6745d0d---nirebagonukeda.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/barufoxanasamilawuko.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/kuburanuf.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/ruruvoxovisugobefisose.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/magowilejawabasanafex.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/57976954813.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/zanujoxisabosagunup.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/75576724171.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/43566207489.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/fb8df438f7d4c9b1f246490c76f1648b/64784301866.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614503998591a---nopez.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e59319d45---25833488334.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/64585140328.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/25388298241.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b57ea846bb---90496333156.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/pejimanemedi.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/97761344926.pdfIn PDF document text
    • http://handgun.ee/media/file/mifotobikiju.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144cedbb4802---bawagazesanesenatawi.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/4079147375.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/43993111341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wildcraft+mod+apk+unlimited+money+and+gemsPDF 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_off0000b3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3ED 11260 bytes
SHA-256: b218b87c821691d3da3a7c8bd34ebf4faf3aad98fb5bcec4aa2dbe7bc1f72dc5
font_01_sfnt_off0000ce23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE23 14536 bytes
SHA-256: 9537110a8beb8bef4cbde1db24e8aa77b3af339a69394b09df93121aa5207f91
font_02_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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