Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da5ccb66177efcc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 08:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f84b83d5ae838bec72c0a49f0ab64cc SHA-1: 11c90fe735efee636ca179ef6450a66d0f245413 SHA-256: 2da5ccb66177efcc9dcc29fcb046af0f3ef89b2b02b3525031553e388950dffc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links points towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cometsecurity.in/admin/userfiles/file/89004841648.pdf In PDF document text
    • http://studioguatta.it/userfiles/files/vuderaxixuwinoz.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/dugowaro.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/68e22a5624900770ab62ffc8980054e6/tetebunodubutijuvod.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/51a9a224a6c198b6a76e0fabb129b0b4/dopewam.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/rezasunuxawop.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/ripan.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/25778703144.pdfIn PDF document text
    • https://umutfm.com/resimler/files/kewasavijeriliregapowi.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/22857013191.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0d776a1c---saxuzajujaxed.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/40411683284.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/jiwepepigowofelof.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/83057692709.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa9e2ce10---divigamu.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/4912780968.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/629557237.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/30414848199.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/65098786450.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/7574443374.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/31118150795.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/5931405909.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1f7dd77bd---10796123782.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/pefefujirefu.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/44109743118.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/92157976898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=i+want+to+play+a+game+offlinePDF 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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 10584 bytes
SHA-256: d7050578b6ab47635c834a201b8473f13c59c7d212c72ae5a47b5cb813c5ae14
font_01_sfnt_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 18176 bytes
SHA-256: db9790b7d5693f4791eea6994bd3dc5e3b17621adaaae05ad65a7d45806ecb3f
font_02_sfnt_off0001200e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1