Malicious PDF — malware analysis report

Static analysis result for SHA-256 c070bffdcb626849…

MALICIOUS

PDF

90.1 KB Created: 2021-09-16 19:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ea3d95700fd3f5d54fbd07a05e24531 SHA-1: 264b45e3e1d07667a1bf5d756f1d51124cbba924 SHA-256: c070bffdcb62684956e958792f9f7421c22dd23eba3f8287c3f3aae5e23873cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised or disposable domains, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dejede.com/userfiles/file/1857226896.pdf In PDF document text
    • http://urgentcarepb.com/userfiles/file/momof.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210901160147.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/noforunetivovora.pdfIn PDF document text
    • http://kahasat.cz/data/file/nobokat.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/lupuzirezuwejokesuluza.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/38437823476.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b567d3aeca---seritupibaxawe.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/63a6b008852161c24775a6ceaf4eadb7/bidagijekaki.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/5196944929.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rolobifebizabalosojis.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/bazowowalujumixe.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353ae496b29---pifanufenedawoze.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/57597788936.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136db20b0771---jamifowepusuvajazedosatoz.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/lepawagezafusataduk.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/75653439729.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/xokulizukubo.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109090325259359.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210911104635_dmF0b3RvdHV2dWZhZGl4YWZv.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/legatidetufaj.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/85650824861311d9dce149.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/gorilir.pdfIn PDF document text
    • http://tecksco.com/upload/files/7502338669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tamil+historical+novels+pdf+free+downloadPDF 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_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 18352 bytes
SHA-256: bb75519581864c6f9790d37bfc09f2ceb99532068fa9f8b88ba754a0a1794d4e
font_01_sfnt_off000128b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CB 11000 bytes
SHA-256: 2f06509bbc1f5697639be6969f806e540c0763d25843faa60ce2134925bbd6e9