Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd10ce76baf6410e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 02:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d1f0be831e48e4b9d64211473d60ab8 SHA-1: 556386df4f9ee07ad8a06766e400261fb0693a47 SHA-256: fd10ce76baf6410ecc1e94b52db8a3e8843f8328be474dff5a2fdd739907054e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The presence of these link farms suggests an attempt to lure users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://titusauto.hu/kepek/file/matolilonovogebus.pdf In PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/jgfn0a2ippk2u2es7m7kvrfh5s/peneligerinimisezamoz.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854f7f46752---bifepasew.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/54951339078.pdfIn PDF document text
    • http://rotang.net/userfiles/file/xatowo.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f8aeca5e---76049851950.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f698580d---lixalavefapob.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/pfitkkgs9ed6hargn8fobom9fc/53598035975.pdfIn PDF document text
    • http://allasclub.com/campannas/file/73157234479.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/2268015810.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/80053424306.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/bejafofirajubekurupomefa.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873122ac822---gelaxebuvebupitosedoro.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/fd502887c512f811b5e5e2fb0fcb7aca/venixedepumefasevuse.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/zosiwuw.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/86933725019.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2cb9c5921eed60ccd88890ea6a5e8abf/voreburakulibadoserin.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/pasadifajirurojuz.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/zorezenipoputelexun.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/10683719737.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bac46d126ebb923d6cfbd2d36f2466bd/42700156074.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/949eb6fbaf3b30f03ae092ab85ac5611/ratovep.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e8d6cf68f---xipaporamapedakojafi.pdfIn PDF document text
    • http://vodnik48.ru/content/file/monosorixi.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/55361591746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=manualidades+de+halloween+para+decorar+la+casaPDF 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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 10692 bytes
SHA-256: 7da5671679cf83739d693e4821832d1fd1ff48ca37343c1e5f80a67610853525
font_01_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 18680 bytes
SHA-256: 700dcbdd14de967330682267efcc51ddb38200b54815e56489c48ee74c310f14
font_02_sfnt_off000122bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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