Malicious PDF — malware analysis report

Static analysis result for SHA-256 617e833910119cb9…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 12:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ad1e4a8a200d52c72472b4afef13e52 SHA-1: 8b5c7af73d06e5f2369c038a89f383322150eb03 SHA-256: 617e833910119cb91b995b67a01f0e6fbe272d37af4df5e20b4cd811e1984bde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver further malware or phishing content. No scripts were extracted, but the structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a346526329f7a085bbe2301ebae3df57/lomejaxevitifagekazomaxad.pdf In PDF document text
    • http://vertracapital.com/uploads/files/dafagosowimirevus.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/50215416266.pdfIn PDF document text
    • http://napiarsaigh.com/images/84648780960.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210914/0312289504.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/58152066431.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/b9dcq7f876rn1gk1s2krht989q/28623731756.pdfIn PDF document text
    • http://methese.com/upload/files/68647010163.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/94017078608.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/7330207774.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/8943478922.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/fosojuvikovogodukoluwaro.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/21451892311.pdfIn PDF document text
    • http://seritour.com/rsm/files/56384369428.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec96fc2865---72817618653.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/71746640608.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/40031358653.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135795a974ec---53491467911.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/16145098397.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/73466526769.pdfIn PDF document text
    • http://stattus.com/assets/file/pasigabum.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/kakiseluwakedig.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2ea58fb7f45dd7871cd1c2ab4126dc58/zibed.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/lumegajatezaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=amazfit+watch+app+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 10296 bytes
SHA-256: 4439fabcf83b3b056ed2e885aa0aa2205fbfc84f1fdc27fb991779f0be21ae51
font_02_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 20344 bytes
SHA-256: c920a163f5f89a369019aba8df080be04ea1c3e60494d67cf042ea35a823bb4e