Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f97df975a7b612…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 04:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dd8f9dcf6b6775f401403dc04729026 SHA-1: e2de033a259cc2cc241b9d0d139633ae2f7fba53 SHA-256: 89f97df975a7b6128964580bfc0ddbc9db37e2f1942d8af1773ed799af7b5622
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users into clicking on potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://casabresciani.it/uploads/file/5778037246.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44ad39531a---19482783045.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609881e28e0bb---27254849530.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/j9soojg1t7d1af95hujst0qspg/83771258482.pdf
    • http://hevolta.com/upload/file/5654851909.pdf
    • https://ferado.vn/userfiles/file/duzananibikesobap.pdf
    • https://salvatoredivilio.it/userfiles/file/55343978419.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607634b7e0c08---nilogemilaguweda.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce4a6b2a47---boberokalenivafusekufipa.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/4c09rj2dis7m7jo5a5v9jj3411/zefulajarisulewareza.pdf
    • http://vorne-sitzen.eu/pcms/content/file/gararixaga.pdf
    • http://orvosvalaszto.hu/uploads/files/jalimoduwidikukakoto.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3913470f1---nakanigula.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/5f642eb5d242c9eba6ddff81532537a6/palorejewunojezuregipuwe.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/23epc70ql5hlpp2i56nd83aqe5/24312839267.pdf
    • http://unsersohn.ch/images/file/tesep.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b162f1db92a---xajopena.pdf
    • http://webursitet.org/Files/file/milevonupediwobazosizuv.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/micm6c617ke873lt6kgk8ij77l/zuvisir.pdf
    • http://moyamoya.center/images/hand_uploaded/files/pujabaf.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a745a244e7b---11034812195.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/95174474078.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/akhg2kihq3dilmsvlcpp6vnpk5/saxijeguzamapopilu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=introduction+to+management+accounting+16th+edition+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e1.bin
89f32e374f6448ad72b6ba8f36cc8797fe4d95cf8f715a49d8578902e2adb160
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 11124 bytes
font_01_sfnt_off00010276.bin
cdccc0175f032a952f6b62a72df20a2e211d6c9d7547c4ef7177179ff53d5142
pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 17616 bytes
font_02_sfnt_off000130d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D3 16792 bytes