Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b47a4c15e38caad…

MALICIOUS

PDF

91.4 KB Created: 2021-07-07 03:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9190a7594422df7cf600c89ce197770b SHA-1: 427b985291469520436c19b25aee21f6a9ef84c8 SHA-256: 1b47a4c15e38caadc905a4f9c02734c4761c25390d0db3647f3646907009066f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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
  • 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://esportenerd.com/app/webroot/ckfinder/userfiles/files/zuvimasozek.pdf In PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/49a95b335fc2de767a2fac279588994c/perokura.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8551c426b---30739368566.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/vuc5f4mh63elc0g6g0po3ribpk/xusuvorizejumufujope.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c1fbe72e97a1383fc16a7047c7508cd8/zajozebarapuke.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/kupufifubu.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/kutozerezi.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/92182412531.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/95204476725.pdfIn PDF document text
    • http://poorclarescork.ie/images/17246959375.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607f590270731---42894481954.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8ee349a3440520c748508fb548b9b6b4/95282937629.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/nudukiwopafe.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/kasebubifuv.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/2719043989.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/ruwakafezazisoxunisex.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/97302726750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=who+created+the+triple+alliancePDF 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_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 17348 bytes
SHA-256: ac417530e91d2c614511f3135781d0e4fe3b068b38e4b2812ac3c502244ad932
font_01_sfnt_off0001314b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14962 10436 bytes
SHA-256: 95413bb8abc9dede55c311b416131f8adc647cf0433bf2f4fdaebc171a8972fe