Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf51b92ffa7c7b43…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 08:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ebde998c0ff1a73c29d36d5b67dd222 SHA-1: 42b0903331d53aa44f4b55eaf3b00e853fa6bd6b SHA-256: cf51b92ffa7c7b436eaf06307feaf3882bf828242a701302f3094f437fff9de2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to potentially compromised CMS uploads and disposable hosting. The presence of urgency and download button lures suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious workflow, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oykufestivali.com/ckfinder/userfiles/files/25552450288.pdf In PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/kagevasolakekunegak.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/retowugizogiwig.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/68629812608.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/63597178213.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/63433574687.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/gibagunujabusunedo.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/fanujeno.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161356b1ea60db---fumasukimovixewuxezega.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/44793882788.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/75393561243.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/katozetizafo.pdfIn PDF document text
    • https://andhimazhai.com/images/files/66008253142.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/da92fe20903460a7db57e5fe4b0f342a/36572763762.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/35784661390.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/vupodabozotumifagu.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/vebatenupegosotuses.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/naniru.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/mifegilunevujenaxunip.pdfIn PDF document text
    • http://strandedtattoo.info/file/46868949605.pdfIn PDF document text
    • http://sql110.com/pic/fifapewiwodoxanejipes.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/sididufokobop.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/xafigatijiwigos.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/m6g3lr35eftu5hfif6ji3hlpfo/72338576078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=vada+chennai+full+movie+tamilrockersPDF 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_off0000b74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74D 17968 bytes
SHA-256: 7a54b046bafc488a781887a820780ff77e6969e524424ee285653c8b077cfa38
font_01_sfnt_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 10968 bytes
SHA-256: 778089ee3ddf4eb53acef3ec8d49fec2edb6f8ecaf12526e44cc8da1ab99641b
font_02_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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