Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee1cae88d7a2a6c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 10:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: edb7661141e728dadc65381fc64086a5 SHA-1: 06d17a0ccafefbd50a7744ea52ab11ccbc62040a SHA-256: bee1cae88d7a2a6c025b463b072bc737f54f2685096692c59f10509d3f691842
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://soluzionebenessere.eu/userfiles/files/bakumup.pdf In PDF document text
    • https://terrebleue.org/userfiles/file/99332607886.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/21354694440.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/2764744055.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630629103.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/37031745566.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/gunazeviralarifovadoku.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/38858095036.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/q41npd097qtf6d1iik3t71q6e2/65736171596.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/fugizaxomarovibarebowaxu.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/83449397252.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/naxikiri.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140817b5779a---siledelukefifalug.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/91185894497.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109171726505121.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edfbf0eb1d---buzuk.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/k8kkeqrvc31mp5dlnfid86gh3n/71698304203.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/1a555b0e8d42e6176130289d32b39567/vadoko.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/gedipafaxaxuvikuku.pdfIn PDF document text
    • http://master-vin.ru/files/file/18970985209.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/rinolazozimopilesotelulom.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/pupuwajovidezefajimemin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=construction+simulator+2+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 10972 bytes
SHA-256: 3b5280f6af0edeac7ea0ccd592c92b8f4129d1c011704d865235a48df88b5c30
font_02_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 21268 bytes
SHA-256: 371bd9ee1148333c8b9278a2fa1bf7f4e5d8ddb62ed0095df4f2cdc97b3ba044

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