Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e009e43841eaeb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 23:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 70b09ec777cb6e2c75faa3b129ee6165 SHA-1: 8dd4c401eaeb0860d2096ae86553020ec9d621c7 SHA-256: e6e009e43841eaeb4d298e699478b2cddb1e5629ac2e2dd044f85a81626583f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the file is likely used to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://branonperformance.com/ckfinder/userfiles/files/pibanatetuvo.pdf In PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gafedugazupumepumi.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/34151105783.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3d4d4df146e34ebf0016fcf6e3594d6d/nikumutujazeziwix.pdfIn PDF document text
    • https://wsbtitan.com/images/file/26561855594.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/vosudaxemopozojuf.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9794ac3b6f---44974885190.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/89047814932.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/novotilexiwidu.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/xoperebixa.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/95378237647.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feaccc39ab---38289170149.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa05331bcd---91873773098.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/zofipasuxatuzuv.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59cb258143---mixabesavirenubobu.pdfIn PDF document text
    • https://topupdana.com/contents//files/tegagan.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/6alalrafucfdnr178jmblu9ec6/belutamorurujomem.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/49kln6pe9a31ppcf4mg202v9mi/31507451729.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/derito.pdfIn PDF document text
    • http://adveotec.com/img/file/52086072508.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/votinutefibinifa.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/volusoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=neonatology+pdf+downloadPDF 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_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 18132 bytes
SHA-256: 42e521e53cca93b6fd278e37caf964127a9e155122af2233b3a186dffd356d24
font_01_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 10488 bytes
SHA-256: d45f9843187bd4f2fb3e0b3829e4c19b982246aac6acb1432b56df3e8fcbf830
font_02_sfnt_off00011e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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