Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2d0a5c3c4a2065…

MALICIOUS

PDF

71.8 KB Created: 2021-09-09 23:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c3f947006d61b4676ef84815773d03d SHA-1: 9da616c9199683541b19abd3d1702eedab3f1c23 SHA-256: 9f2d0a5c3c4a2065cdf60114a8024bc60bf00b66a07cae2eaac63e6a4503778f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malware or phishing content. The presence of numerous PDF files hosted on various domains indicates a coordinated effort to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/kimukarolezexe.pdf In PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/jusasibusurosixibon.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134d3f23e7c0---zatomeregeburavewodofo.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/wunuwupinifipusigoloses.pdfIn PDF document text
    • https://esz.jp/img/editor/files/nukitetamu.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/96366429158.pdfIn PDF document text
    • http://willbramephotography.com/47871694104.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bekupezetorepimugamu.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/95949029895.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324c1e6a504---11941380292.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131140bac9f8---zuwapafivifumujatujegotux.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/pajobetuj.pdfIn PDF document text
    • http://babamoleskine.com/files/file/kapibobimasukabazanaval.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/27030086641.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/wapufumujo.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/79637684182.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/96594161242.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bbhg8e7rb4mglum58g8d2jva62/54206388525.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/14456c5f376987a5eda6b9a51af2fcaa/38217265894.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/ridopibimuboxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=betking+mobile+app+download+for+androidPDF 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_off0000b4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 17464 bytes
SHA-256: 8b270e96367db2f8c01ee902c257984d3c7fc5635aebb4b7bd1b5f4e91f9a366
font_01_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 11044 bytes
SHA-256: 0f951d900b5de16966b03a501df7321430a7f649908bd9ad74e6a1e3073bf138
font_02_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1