Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41cfe49441f8c36…

MALICIOUS

PDF

85.4 KB Created: 2021-08-16 03:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 62de9e96e4c3589350367c0dd957d1db SHA-1: de2b8e7fdb0ed9658a0ff64592f9b2f594cdb32d SHA-256: e41cfe49441f8c3658bd5812663f4da3cc0a1ee7a23714d92242ffec5de6b83a
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms links to compromised WordPress upload storage. The embedded JavaScript likely facilitates the redirection or download of malicious content, and the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42b7e2450---39837931236.pdf In PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/ninaxibefozezolegagab.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/99014756781.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/gowejugusimotitizepig.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/43649559523.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/16466540792.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210613215113.pdfIn PDF document text
    • https://congchung7.com/upload/file/26576370464.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ffff28a6b55cc5ebefc66cfcdc5259ee/vipenukufanar.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/85717224092.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4980136984---gozusikavusalogidabiwov.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/35030461352.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e635c997f---komuxixufinemilukes.pdfIn PDF document text
    • http://findacommodity.com/upload/file/retagalugajomelebokogoges.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/88239574030.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96d6b3ed7---muzakalafixibilonobonis.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de495a00de---reseduxamedusofu.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81fe6fa26---rovavujiwiwafasugiziso.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/41007317692.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe89d76391---73805041203.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/xizuf.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/67121a1de16182536315521a3034d971/35593361829.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1c72a8f1---fabimokojivoj.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/xelunumupakomazaroxiwulur.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d1e1aa545469f9aa80fd263f8e342ac5/mibadijuxilisivuzeligulo.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/fewuruzazomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sivapuranam+lyrics+tamil+pdf+downloadPDF 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_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 19432 bytes
SHA-256: dedff5ce9e03eca540e4fb3eba7dabf5edf71e1f76dadb3e82134928e3d033a5
font_01_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D06 11092 bytes
SHA-256: 82687d2931a90d34439af2ea6ef5a0f24153216ee6697966ccfe997981156541

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