Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc85c8d65d11e215…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 01:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cea8b5c9a22c88c7e214abae8bb44e8e SHA-1: 4e81e4f225983d82bfbd145b7f722117ace05beb SHA-256: dc85c8d65d11e2159bcb44dfcef1f94be7ee340b433a26a09228e1a969922746
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm nature are common for initial access via spearphishing attachments.

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://martan.es/cenavarra_userfiles/files/bodapaferegavo.pdf In PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/luzaruni.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/paboxopijazuwazizib.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135c23dc80d9---19646970047.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/25365157336.pdfIn PDF document text
    • https://rajaunited.com/contents/files/kefofowibizagufojaruguxi.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/bewug.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/51227760674.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/dizasifor.pdfIn PDF document text
    • http://landpas.pl/upload/file/vepipanuxagetusuzadi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/g9rv03vkg7f341qh79rhrevqg2/gipupifidatarumedife.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/zudogovokemiwobonud.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed7eab89f---8311962798.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210916065347.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/39813550367.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/64341027767.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3d05cdba18288536c8b7c684047de30b/57708537101.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/56693981178.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/vuzupofig.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/82677143670.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/75926504319.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/xuxefubareja.pdfIn PDF document text
    • http://safarang.com/basefile/files/27402932242.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109101915479000.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/fojebisamazumometil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=60+inch+led+price+in+pakistanPDF 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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 10776 bytes
SHA-256: 426c30427b8f0baf0cb3ff5ddc09e1dd1673d51fbf836a1e87f4705ba7c0a64e
font_02_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 18096 bytes
SHA-256: 476146db2f07824609b6513beb354fdf3031ca391addfaae9bfde187c2210987

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