Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86b62321481dc25…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 07:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe341b463d4f9716bda96734a6b3b2a2 SHA-1: bbd6d3c3991c9f8b7ef90ed4b649b8ba08d6dc4d SHA-256: e86b62321481dc25f551d290b5139679d503d786d60fce5e2123083ff53e0181
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, designed to redirect users to external resources. The presence of multiple PDF links and the use of UTM parameters suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://hndgyl.com/v15/Upload/file/2021961158448441.pdf In PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/jepojirobufomenidudode.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/5303923374.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/raxalojuzudeborisijujewum.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/79373434780.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/98106958127.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16147f945576b5---46442329357.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/pumetipafewemaroxiwogev.pdfIn PDF document text
    • https://koratspring.com/upload/file/parawuvu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9112887d9ab99a1ebdbf2565c959949c/nigekex.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/64178926573.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/petivowemovu.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/17057815686130a3e5f1de4.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161332954e2c5d---31495745997.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/fanujaferebosadiduna.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/nogumus.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/97643831748.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161340a941b73b---wujevakometivomi.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/52155085873.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/2557783915.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e0b2cf03---40721158603.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/20871233755.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/josefanateritozisewimad.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dh7a74h3a2s3vu3h14an5bf1n5/17834056731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=new+v10+apk+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_off0000cbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC6 17804 bytes
SHA-256: 20a7fbd84e6ea1bbd0e41e5c345f6eaa2049972e601ac810ff1aeec66923d7fd
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10320 bytes
SHA-256: e631fc8f568ec70ac896f548427c30a18e70144066cf381aa8d861a35879c2e8
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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