Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d1473c46c6602c…

MALICIOUS

PDF

85.1 KB Created: 2021-08-23 09:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: afc74ea7e7f00112b39ad9ec7865f38c SHA-1: 71dd01a16b81f1ad956959cc3923d7c73cf3490c SHA-256: 42d1473c46c6602c28ca8bf69dfdd1d78ded1ffb35041ed4e0b84d5c6110d09a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://petala.gr/userfiles/file/bapuxutulisavutivorizo.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b40dedd2---xisukajasasidetijavona.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/sibupijezibiri.pdfIn PDF document text
    • https://ghnservizi.com/file/28125506165.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160949bde24fa4---gogosudewofusi.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/widatabofuvabafidura.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161094a92e6db5---zutiwek.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/lutofo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/09d929b0c5dbaf16810c300300d47209/vimituderawik.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/18358683478.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160774a46b2874---sofimodasezaxeweg.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/nujazukuvalepepeporakipu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af6fb8483c---63164314268.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/tifatiduxutaxolifum.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/wotemevaba.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/77910819078.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/8324610436.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/68911234884.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160979e2c522bf---suzajakuziduleneni.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/97e7292b9aee2cb258f5bf7671e2b1c4/9749463521.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af2c8377d80---fovewunukarusivolefem.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cb0ef5ae4bc97902f60d15a5a1126ef/xikoxoxu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/cecm8uic7h6ou8svl5oid8pth4/seripapox.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/84271438427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=connect+two+hard+drives+in+one+computerPDF 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_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 11016 bytes
SHA-256: 5f30835207cfbe3e9051d6570f29a60032133349d0b9106b9b698e4125247b68
font_01_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 16700 bytes
SHA-256: b8c912d1ce83645f1ec0c7f69abe848d582f752dc24eb38a4d8e2164b5584008
font_02_sfnt_off00012cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1