Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bcf759dc823ec4…

MALICIOUS

PDF

94.1 KB Created: 2021-06-26 12:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: affa011d640fce86e5b1f8bbacd765f1 SHA-1: b11a4116a12c6d520b3fdd33789e6e804ac21615 SHA-256: 40bcf759dc823ec47834f17049160ba82018c11cb1bb1c8b68f90d43128f9ad3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, indicative of a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly support its malicious nature. The document body is unreadable, but the heuristic firings and URL analysis clearly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://classicalgardenornaments.com/uplds/file/52913995044.pdf In PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/895dcfc7b98d6e1c4f7878cc31c41336/42507771686.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/gezid.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c49b6e7b7a2---27549854071.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f524fb10c4---wawegesowonapuno.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/68457053529.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/84855566915.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210624041645.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/dadamibinibedipepem.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b455042cc53---rasivakojobosejedodokevi.pdfIn PDF document text
    • http://staropolski.net/Upload/file/44795052878.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f104a6f7a1fcabe6888ae8e75905cc52/sakomajiz.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/96241479354.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3uk5brf799cksotv5ppfpdn522/35888730205.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/1cb6d9924bc9f4aa7c7e3947dea6b3a9/56873371464.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3122c734---rogutor.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/19823240477.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe170da74c---47096477745.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/zumatomesozeki.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/js0a6ek2qb1heb9jfjuaa0a009/kofidewulozeganipexoxi.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/kazugutodiv.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa16ec8bd4b---sikagewew.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/rugojuxagivakobimozurusi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1bcc3f5c5---lirogalifurolijusiwor.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/kofazafevirodotigul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=audio+track+for+game+of+thrones+season+8+episode+1PDF 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_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 17432 bytes
SHA-256: ba93ab4065332eb7ff6823534e3771fe7cf1534f2bd9bb85d76ba85ee7cf87d5
font_01_sfnt_off000137df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF6 11456 bytes
SHA-256: 2bad53aa27fd752f41e0fbebe31be3d8b987c26e20e9c116827b4db272395b54