Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b15d52e3d46207…

MALICIOUS

PDF

72.1 KB Created: 2021-08-19 03:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1a2dced2cb00333b65c3808a5275ac2 SHA-1: 6c6ccb7d7caad182102de3af954726c35657486c SHA-256: c3b15d52e3d46207999bd5e165f049808bd3482b1070735c7510a420bb2ce6a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160865dcbe6473---34791009890.pdf
    • http://studiophotosfashion.it/userfiles/files/xukozax.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b4e702a8c---tasowogisofowaliwito.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/lazovugej.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec67a40d2---mebikapixexegorusi.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7o7k03422svsbfbtk10bkjtno5/retofukiliza.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c466336105b---fakudubijowinotikigumo.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763288b9952---63569464582.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/wurixozowamabiwu.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbfadb676e---mupipikukoreguwunisaka.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/t51o24ag6prqcvishlro996g51/gatuw.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/639152d5ede35bba194e0b68d8737ad3/fegalibo.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba03b893f57---44309513794.pdf
    • http://evpltravel.com/xv_image/file/sugaxa.pdf
    • http://dobrasekacka.cz/userfiles/file/71534312112.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/aol8tq6r8715oh4hlisvcn3r50/wimavomoruwuburobazaza.pdf
    • http://gyuco.com/uploadfile/files/20210807_184756.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/u7sllhl4teaicipbkf9u0scrf6/mogejip.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/57685570861.pdf
    • http://cdmatik.com/uploads/file/45015117721.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210514210153.pdf
    • https://www.zochrot.org/ckfinder/userfiles/files/6448301802.pdf
    • http://jrpst.pl/userfiles/file/45049364345.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad303bcb8e4---78563435760.pdf
    • http://macabrey-luthier.fr/data/Files/subufosuke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=due+date+tracker+excel+template
    • 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_off0000bc05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC05 16792 bytes
font_01_sfnt_off0000d41c.bin
785a08ebec8549d547e5f29621d5a24d8dd8bb1e24def70e2fb9017d2334db1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD41C 10484 bytes
font_02_sfnt_off0000ec03.bin
b9aa7e22c89ce5d5a15f33d6436a67453e1fef1ec305845cf7577acaf9b9dd02
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 15120 bytes