Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bc452a0e063c56…

MALICIOUS

PDF

76.8 KB Created: 2021-09-09 00:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33ffde806ff744a82bf0d4946e3d437e SHA-1: 0bc168f9bf7a8db3c2dfb93095bfa21b9f3bd4bf SHA-256: 37bc452a0e063c5628b831cf8a0d300310e347e338d41177c0d6bd961d9d8a1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=danush+tamil+movies+2021 PDF link annotation
    • http://eca.or.th/ckfinder/userfiles/files/63618972490.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/106a330da6811c5058a5cbc955d4c1fe/laretilafitavora.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/80605664264.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/jufufo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-3/20210903075026664753.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/54492593121.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/leberuledosuvozila.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/vezujutojolape.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/vibaxobukor.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/wuneb.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/muditarexasara.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/xujevotowev.pdfIn PDF document text
    • http://innersolutions-uk.com/file/30273973499.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362a2dab46e---77028602797.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/vexuduli.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/14135144555.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/lanobuvawofimekop.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/84049350887.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/39478549519.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/abg5el3pjofumfk0qgfn6scho1/99611908074.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/059955b7e1c036f89c3fb30d1bf97055/3018615624.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/94432408335.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9dc85a17aa386069621fb93c209d58a3/77572819165.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_off0000c84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84F 17524 bytes
SHA-256: 4a5c77baecd915d573da2b01142c0063747e5d0b14111db4f2db7120d3067fb3
font_01_sfnt_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 10736 bytes
SHA-256: 1e7f09d685a34c8fd3c6cf85af526d400790cd5647e6cefafef50618239eeaaa
font_02_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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