Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafc0284c56dfb69…

MALICIOUS

PDF

117.0 KB Created: 2021-06-28 09:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 82f6ffc56c515f6b1899b882c3cf292e SHA-1: feffbb9409d2621869b1d9730603557804e173e8 SHA-256: aafc0284c56dfb69aac4d93c0114e493d0a4c6c190099535a9b4ed6f034ffc03
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

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 https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772e6898032---fokoxote.pdf In PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/33723801524.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160982d821ea31---bitup.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/r5h6u27k0p7rm3kqbafnlt0um1/97463699936.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dab520f77---5556795827.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714c374010b---jozetu.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/fuvofogasute.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210606193602.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/neviwexugediwukijoxipagos.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc7de30957---nepivudonilurolid.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609adaf3f1be6---78745473745.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/62888839755.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc97bac13be---6269459287.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/mineme.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a173ce3997---sujirurafifexibifufa.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/6440372644.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/f6821hrt02bj6pttit5hjmht41/viwusaw.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/f7310572dfbf7a05d563f03430b4f1ec/36905499105.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/48967923655.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abede2c1e2a---15515479820.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/86548743281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+read+a+book+epubPDF 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_off00016662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16662 10384 bytes
SHA-256: 7f3eb82aa099e96dfd36a5fbf0301664c5fbbfcc36b668af09cff5ce1965de3c
font_01_sfnt_off00017dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DC9 18244 bytes
SHA-256: 22d6aade13ebb7a11ceb6b8ab2fe8ed11716fa77539c6b9be9b8194399d499ad
font_02_sfnt_off0001ad3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1