Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da5b70bc4d05ecb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 17:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fb36a891fd8fe9583b3a2f207d2f1f80 SHA-1: 6c5a5b0a949f9b74608f90701ca87ae4717c2a10 SHA-256: 2da5b70bc4d05ecbbcdd62143c23c2e059c93072f74988bf4a7eedcf8807014c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the PDF structure suggest it's designed to exploit users by leading them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crysiq.ru/uplcv?utm_term=how+do+i+download+play+store+on+my+phone PDF link annotation
    • https://luxm.pl/userfiles/file/62037664224.pdfIn PDF document text
    • https://sealskinz.ru/files/file/tasozaso.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/pavufibotuxexesiv.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/sinerixupofozada.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/wujegupixome.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/fofofolab.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/zutexalepijegebaxijum.pdfIn PDF document text
    • https://theurbanthinktank.com/files/fileserunoponosemokip.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/69944754397.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/nupenerowofisun.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/16823605248.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/pidavopugozozozexe.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/57436123159.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b698980dee16fabb3f6c97bac7584654/wiwinosixazuxinosi.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/kukomi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ab68998a---wurixowusiwebun.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/61736769689.pdfIn PDF document text
    • https://zzhqhi.com/d/files/34010034960.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea7a9efb5---wagojumezajeped.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210911_EC4D37009B76FCAE.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/fijasa.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/sowapixuritefazed.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/45375699855.pdfIn PDF document text
    • http://fourfoods.com/images/files/92664611965.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 17748 bytes
SHA-256: 43a011450f838dc0d94faa4db130d4fcf07e94a1ff22c51c1df6feeb57a73465
font_01_sfnt_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 10848 bytes
SHA-256: ab483385e51e604fbd65ee0a797df0a2805543307209760b2277dd91e04ec15f
font_02_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1