Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e375b6bf1ffa0b…

MALICIOUS

PDF

90.7 KB Created: 2021-08-09 22:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4cc04d911a7542f1a97301d8b9766bbb SHA-1: 1de42a0bd3154eafc641a416cce4e7e973dcf70d SHA-256: 42e375b6bf1ffa0b484de9cda3a28ee824a815805d69bf81fec7bd8a5feb2eee
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to external sites via a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081812aa036d---18180158093.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/sd2afbl0amjbhom9igv7fu4cs3/6516761422.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/9i24iv2uk3oj0vdh4e6r559sau/34554544110.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/22789908047.pdfIn PDF document text
    • http://ausafe.net/images/art/files/54558118169.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9b4a64881fead521b2143714ca838c97/dejoj.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d62dbb3a86---80071554276.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vadizek.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/75743603764.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/midudejisebiwinobikuxifap.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/1fa84cec0a0370f8c10ac12960d22c79/redolidudowizidososorawaw.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/87522118904.pdfIn PDF document text
    • http://willbramephotography.com/kotimenaritilojo.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/95117587564.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///tuxajevutodi.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/xezatidujofawoxevosetakan.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db82b0f6b3---4912492163.pdfIn PDF document text
    • http://debden.org/userfiles/file/66179862410.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051122364225.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db736d0fc3b---sadukebalovonov.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/40eaef64098acf10fd983f3a5ce0935e/53821069711.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/0l201lhpumegoce5ajj5ffhkl6/9904145294.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/lamorom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=guion+teatral+de+los+tres+cochinitos+para+ni%C3%B1osPDF 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_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 10956 bytes
SHA-256: 241fe4f4015cebf5e09172e6e2c639f0b569f12e4059ce3b345926cfc83bf290
font_02_sfnt_off00012a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A43 18612 bytes
SHA-256: 5e991896c5a5d67139f94ca63f97e14c948d4027e17de311f56e5282a6614d0c

Open this report in the interactive analyzer, or submit your own file for analysis.