Malicious PDF — malware analysis report

Static analysis result for SHA-256 c434d325edb916fc…

MALICIOUS

PDF

101.1 KB Created: 2021-08-10 20:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d70774bf7cb348fa82dca653fc77c95 SHA-1: 7a84af704909a62a2bd1b636899acca7eb5de089 SHA-256: c434d325edb916fcb6f43ce71063c69cae4d2a52bfe537414f8d9e9eb2161ee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kodcomputers.ro/2664/uploads/gamezabadaganolalijupi.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5973f3b35b9cff6d7214c1be7dbd33da/zodevagagadonimavuwipuga.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160944bfc2d89f---fopifidodedivuge.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/46224158721.pdf
    • https://aronabritcan.com/userfiles/file/47081656605.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/runevos.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f3796056---potoxik.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a31b9c4f680---bewosirobetutisawatupo.pdf
    • http://abaj.cz/UserFiles/File/towaf.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/47nc7s4lidddv16q1e7t1195k2/67084018799.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a869d69969---lurubavij.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f191bd159---92478248659.pdf
    • http://gancza.pl/userfiles/file/pejaluzana.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/gekujulokezirosuzesili.pdf
    • https://deepex.hu/hirek/files/zemoxudi.pdf
    • https://weyergans-hcc.lv/userfiles/file/15316448649.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49437834ee---koxoruzosaxatuxajukilerop.pdf
    • http://szakkepzosiklos.hu/upload/file/dipidumenigetetimatala.pdf
    • http://eventechsite.com/files/files/28568574389.pdf
    • http://abnicum.com/files/file/32018124816.pdf
    • http://ipmarketing.net/userfiles/file/74626025690.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd03329e2d---zolubux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+invisible+hand+theory+and+who+introduced+where+and+when
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/67f10bf50cd06d92533708b381f07fe2/nifazasovubesididupozirem.pdf
    • 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_off000129be.bin
1b5732419eb492db36cd16e0063b72ff6eec8667338a1f58067ac684ff1e2c81
pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 10968 bytes
font_01_sfnt_off00014330.bin
edf7e6d09b05dd4b5113a26e7cf577294799ae2a85f7c3ac6c88fa0f3b339284
pdf-font-stream PDF embedded font (sfnt) at offset 0x14330 16636 bytes
font_02_sfnt_off00016e19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E19 16792 bytes