Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3369b5e778a99e…

MALICIOUS

PDF

94.1 KB Created: 2021-07-08 08:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45908229815d18a071b6b1a1f5f3873e SHA-1: 9f89cc81dd2ef36b2734f933ffafebdfd5c38d7f SHA-256: 3f3369b5e778a99ea7d345ac9e5d49a98409df57a94da80e9affe1eb281caca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous external domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://jairdefreitas.com/ckfinder/userfiles/files/negalekaterezoruda.pdf In PDF document text
    • http://kcde.kr/userfiles/file/rugegavujubi.pdfIn PDF document text
    • https://caffedisanto.it/file/fifijovakejis.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/gebekoxebusanu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608641ffca261---23533364843.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/bikovibamazilonufuto.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1482d8402465701903c9b1fc1113a26f/55923441696.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/20077104262.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/910a258df3afc354a60a3511c74c6e5a/zukesojodibebufigatala.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607e129e201c6---mafobubixa.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160705b66d8632---77263562479.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ljd6r966jigchjnol4fok5o6hu/97004860644.pdfIn PDF document text
    • http://wwstationery.com/files/file/54076420197.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021060705123060.pdfIn PDF document text
    • http://martonelektro.hu/files/file/31424256396.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be697b47303---12659080284.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16077430c5ab63---dexixizudogod.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/79932867649.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/nf9j157hmatipf5l85dgbtqf4q/78538108854.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ac0caeae---14979967210.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/3f19cd372386f9bf0ad7f565335e0e09/30276237129.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ms66ta8lgmmsdiehdcghf1b4u1/sulevawubazidokowadibezil.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f8ffb4552---7716086938.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0a628260be0ae1121af3275861f4e22a/42124124180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=embedded+systems+notes+pdf+for+csePDF 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_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 16608 bytes
SHA-256: 24c50b82f1ecdd61e260cfde72ddb01d7294f5cd4bacffbf21f77ec047acd454
font_02_sfnt_off000150ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EC 10720 bytes
SHA-256: 082e428332f79a64715f36ee0ceccb33e6bf12c20ba3ea125542cc975b94a896

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