Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7fb225ad3730bf…

MALICIOUS

PDF

90.3 KB Created: 2021-06-25 23:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a80a39c7ceb44c479b97309c4b88406 SHA-1: 06d7c00b1b0143b23c4d32fac0cc8b17f5bda4f7 SHA-256: 6a7fb225ad3730bf7ac680e04038db1178cf642817336ef86d1c1cae3fccb36e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The PDF structure and embedded links indicate an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/8792f4985831325b5d595b6d7ca760b6/fipudasenegaguvolunejija.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0b1a94384d8236f1402a62aa6309fcfb/43786469090.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a345e8cca63---2273498535.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a94317be2b2---paxixur.pdf
    • http://stin-verdon.fr/assets/Image//files/nobebunu.pdf
    • http://spc1991.com/ckfinder/userfiles/files/xedobegazedulosesunoluvaz.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1d899a9220d99994dfff638109566e28/13998038841.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/24838531005.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8c4df291d---14341974760.pdf
    • http://cartonwrappingmachine.com/userfiles/file/vuwuraketodexidubaka.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/75889106250.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815474b0246---tebevedajonibur.pdf
    • https://ferado.vn/userfiles/file/68510440273.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c444f8931d---movinefodafenasaxexe.pdf
    • http://muszempilla.com/files/file/bofazoxowujuvuwuxixufod.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c162d619---2838032699.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b608caf5---somerafijomowore.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608743d39a037---28160689910.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/49511091330.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1qvso9egls83eckjbd68vso1ht/pafisepuvo.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/92a2530e0fd47059a7c9cc32bb4218e8/mawosazikuveranan.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7ebmmtcaqrud1svite3265iq0t/84968548245.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a3f6bf7f7---65892678927.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95a5e2caaf---bijifurinas.pdf
    • https://michelbarbot.com/upload/files/wodufaxoxi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=when+to+use+italics+in+scientific+writing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f989.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 16792 bytes
font_01_sfnt_off000111a0.bin
469b28ccde3361598872cfa0d6b0751ac077539b289ba840a8d24861f015d13e
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A0 10796 bytes
font_02_sfnt_off00012a8d.bin
e37559074b2fbb2b24313aad08c8a55298d86f1aeca745bf831a56eb0faa63bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 18512 bytes