Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9f8da8efeab5bf…

MALICIOUS

PDF

88.3 KB Created: 2021-07-05 04:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 09168d0e24fc4d7c2c484e641da46852 SHA-1: 45be4778483421cd78a811bb0c9349aeaf503aa6 SHA-256: 5a9f8da8efeab5bf3395b2f0041b69fc1ca5425f09d421c4a5d89414ca892119
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/985a4e3fc97b55d937f616ead944a460/lajugidunitedumiregojur.pdf In PDF document text
    • https://cplastik.cz/data/cms/file/ligemojoratebidixij.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/afadedafb3dd7efa0f5feb8fd9d70806/38507062649.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/93354fa367a62bf23864b1bd86e263fa/50945169256.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/niwikabesemosufijosoremug.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3f5bb4ae852516cd3e145a7046115236/86793380630.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c695fa9f3c---ropezi.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/bbae531fac90481dbb373657d691048c/58613453127.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840e45db8a4---75737467027.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/81281742302.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/313547727471320c53cd85d0ed083e34/21604681698.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/dibivuzagafa.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608764bf73222---24721532592.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e24c654aede---4756625074.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/woregijuvuputiru.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/pijonugoj.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/fc033621b0554560421d2379a202a98b/98412358934.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/segozanenazomodipibemekep.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f074179e18---polalisi.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/46820920894.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba59546c80---55589052368.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210531161022.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/v55hmj2q2q46n9dbcktk9ifsr7/jotobaxoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+write+a+letter+to+invite+friends+for+marriagePDF 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_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 16872 bytes
SHA-256: ee32d89ca89c3dd9dd5ad0004a0a799b7ebfdb529485d151d8bab7adb32a2826
font_01_sfnt_off000122d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEA 10840 bytes
SHA-256: 576f823dbb9b8acb98f1ab1267207b2bff4d0d3ddaab8c6d1830e17eefaf69af

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