Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad5b865de9f7b8e…

MALICIOUS

PDF

87.0 KB Created: 2021-06-25 23:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-13
MD5: 34f6b5808f06116a7ebc3b6c3961a00c SHA-1: 3be0633820eb60110db81612599de6f0aa4f7849 SHA-256: fad5b865de9f7b8e650c61742d6c282b59d63fcd8477afb677f18542c64f2237
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm hosted on potentially compromised CMS upload storage and disposable hosting. The embedded URLs, while numerous, do not directly indicate a specific malware family, leading to an 'unknown family' classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081348fdcb9d---daguxivotabemafupujuronu.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160706455a05ea---3334496479.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/zovulodunomejeboduwa.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/47090540378.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/2384990440.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/gufafofemilolededusu.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/4fc7b2131a06d26afb5dd2d6bc400844/13321446077.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/libokoxekupanoki.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/574e2e18336baf52eed8bf1e445047e3/16559974303.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1c0436bf---vuduperisirogebapamizojov.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728f061b379---buwes.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/q3trud1g2ks1r6h6s1knpumcgg/53298258182.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c56b77fc977424bbcd454cb701d456cd/povito.pdfIn PDF document text
    • http://ridendo.cz/files/file/pikugib.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa8445dc7---fipojuvibip.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/saguzazadasavabajubij.pdfIn PDF document text
    • http://stevis.cz/files/file/jelekixizazujos.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/fanirerofonifusiromera.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3babf821---24367663448.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/79932416330.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608aedaddfbc1---61959492659.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/1bd3d7633ab32066d580dccd6c24ac10/kefaxer.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/46624187907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gouda+for+mac+and+cheesePDF 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_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 10644 bytes
SHA-256: fa2160639803b319ac8b8f6aecc12eceb1e787c84c46d8d25aa20e0c89ee2d59
font_01_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 17028 bytes
SHA-256: 329cb59e6211aa908d476a1ba99b73e1386ed282ae3b230a0848171d3ebcb1be
font_02_sfnt_off00013580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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