Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd54453e3d2250e3…

MALICIOUS

PDF

73.4 KB Created: 2021-09-13 04:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10044e61f23f1e4960b229d914e47b16 SHA-1: d801ec3e65cd30b745ad5995d952dc82d7f8101e SHA-256: dd54453e3d2250e369c18bfa23828086666d2e290ce5a1282cc8bee33b138e40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=iphone+sales+compared+to+android PDF link annotation
    • https://johanbjerke.se/userfiles/file/62426108123.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/xonovalokawedi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161344fd22bfba---10652781086.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/levasabonelalagusux.pdfIn PDF document text
    • http://newshop.jp/archive/file/ralokaxawik.pdfIn PDF document text
    • http://secoinblock.com/upload/files/33397534441.pdfIn PDF document text
    • http://greenglobepms.com/uploads/nipewulusifolivi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161396f97705f2---jojifopagel.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/36809169913.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/jadalowobok.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/23881199879.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/panuseporidilevitufoku.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/55983350390.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/sabopuzedepol.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161318d6d24d78---97414097399.pdfIn PDF document text
    • http://hodori247.com/uploads/files/goxirefakeses.pdfIn PDF document text
    • http://ibb-online.ru/f/file/sogeketipunodekudajok.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/levimifojusemonowo.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/53675705002.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83414dc4a---jesobidewepajer.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/45912130964.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/24277524592.pdfIn PDF document text
    • http://apothepharma.com/upload/files/60851407970.pdfIn PDF document text
    • 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_off0000bc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3A 10728 bytes
SHA-256: ecb864f3ea0a0f45bac8dd7bf994b0d8d0b7d5ae9ae8cded75f11dbbb5c761a2
font_01_sfnt_off0000d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A4 16920 bytes
SHA-256: ea52a84f32291fc6baa05d819028cc76ca28fb471014ea6172124fce8b6e47cb
font_02_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1