Malicious PDF — malware analysis report

Static analysis result for SHA-256 3088feeaeaa9b35e…

MALICIOUS

PDF

94.0 KB Created: 2021-06-10 04:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7a1e84f8528df1b9e08cc5ae9b4165bb SHA-1: bb9e75df05f91ab77c56b795300d95f67a85edce SHA-256: 3088feeaeaa9b35e81cb3fe9d90bb2f684b137b82159a7b848841c718ecd866a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/uplcv?utm_term=super+fast+vpn+apk PDF link annotation
    • http://3q1p.com/upload/file/210606055024826127e1r00f3o98uc.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a27525946fd---44585841052.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/0f39ec4b89a192447169aad5dc08c467/fobamotizifivuzeg.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/suq6rcefqscucs81tfm6kldceu/fakerusebizov.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160879329c76ae---48733914576.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/74176924762.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/69474291554.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/11a98097c1a3ca63e18ba6d9d57f7e11/70650296156.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/775b52280dea33a24a12b8eae69665d2/wuwarekinotekeziju.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44fb42ba86---93113276108.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/615673f1d8bda63a21feef3c586ff86c/jezeduginomarinimajut.pdfIn PDF document text
    • http://grupophi.es/uploads/files/fixejikoxevoxowib.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607768d9eb37d---25458321510.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d75195764e1dfe4bf1da37c9c0825c65/68068551783.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160aab74f3cb48---revekikiselirobifaxige.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160792d98dafd3---23392319.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/29138807737.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000137e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x137E9 28868 bytes
SHA-256: 2f34717c183c8b1978842d77369e506b996705af7cb17d6aef7a0c6bb8222cea
font_00_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 5088 bytes
SHA-256: 0e0691aadc42ab17c8fac8670c735f07116a8a25725cd85660eda68f12f7aad4
font_01_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 11352 bytes
SHA-256: f1940da822d17745b0a2e5c5f02bd997d9a5261e083a622d501b84e19800c2ed

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