Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4d18297bc3fadf…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 02:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d00153e0cb63672d74a3a97c7db77577 SHA-1: 26b53b3981f51129a1f037d1928daceeb0941aa2 SHA-256: 8f4d18297bc3fadfd4d765c2d333fda9db564ed24cce0b5a37fe98c516c2daf3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of numerous links to disposable or compromised hosting reinforces the malicious intent.

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 https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/k4tq8it606rsiuqnq78nv4labs/6585968411.pdf In PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/53p0epfnen9m5a9de67t1kj550/bakusogunudulujukakuduvi.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2b494eecce7142643f730bfc71b23361/xanutetikan.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e61ed298---90727280187.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/tupuselediwazag.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/9894996272.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/fotizujubinon.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/1fi57ut5tvbmpj0fjh5e4fc1bc/widipuvujovij.pdfIn PDF document text
    • https://alutat.com/data/file/fosix.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/453033a409910c02e16db885fc78566f/fuvege.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ea414e3bfa59b9283b159374c96280dd/91903449060.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/kenesik.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l35u7oioo0u25a2b8v8nrbab47/depukegalepabefagotik.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/tidufevurinar.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/jetolukovapejibidufamifip.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076aeb32078e---76327376891.pdfIn PDF document text
    • http://chapelguild.com/images/usr/91953936353.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0a9ae64890e8713955274c2837f27557/51392620739.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/3012446147.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/8702710953.pdfIn PDF document text
    • https://ms01bet.net/contents/files/nadeturobusosa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161176a243ce0c---gatetinofutikazem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=to+pimp+a+butterfly+grammyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 18116 bytes
SHA-256: 4c127635b8f738b83fd15f83bcbf97ad4db7d421ebcad06dddf54ef616987e8c
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 10744 bytes
SHA-256: 4aa9dde03ed998e0552b64c5796d6aa826880e85bb14f910ed0199e94b1a93ef
font_02_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 17812 bytes
SHA-256: 9f48d2936f9965abf82abdf8f527523cdc0f17e8d0051c3e2ca629fd2d15f563

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