Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ba4acd3ffc870e…

MALICIOUS

PDF

97.1 KB Created: 2021-09-20 23:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61a9f63d96c3774b1e9e0a3b7221224a SHA-1: 3bd8524f405f81b13f74600bcde5b8bdad966079 SHA-256: c4ba4acd3ffc870ea67536df4aa97eeeddd27ff606d61264eef4554df1cd68ae
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://mirai-kankyo.com/userfiles/files/54267629055.pdf In PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/94863444857.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/166154c1895a76ce985b6f6c83325fa7/sefutawozugar.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/38934212100.pdfIn PDF document text
    • http://chinalabware.es/d/files/59560927726.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/87605099399.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/38518959483.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/vafozulavozupakorilig.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/10094758700.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/48596694738.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/63105354830.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/jumisalipizanijoguv.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/badudemiwukidenaweri.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/jekubinaporinuvidoliw.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613228fb29ef4---kosorerof.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d479836263---bozobulawomikazul.pdfIn PDF document text
    • http://slsnn.ru/content/file/bujonifit.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/woxexekasi.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/73957278700.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/gamezefewuzitubomata.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/jotig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=vrom+frp+bypass+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_02_sfnt_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 23996 bytes
SHA-256: 53cc4df583f0e1b73f810bd1ebe6b75a10d94101247f4002d5c2f09203029dcd
font_03_sfnt_off000147f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F3 10360 bytes
SHA-256: 4b36ebc89244828e207ff1f9aff9251b3459650b213c609bd34d1f8c4695b223
font_04_sfnt_off00015f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2D 16380 bytes
SHA-256: a0f8d38deac41f71ff5822160fa568ccb8e6b2c86cb1c8dc578b75d8d834f6ac

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