Malicious PDF — malware analysis report

Static analysis result for SHA-256 98337fe1cc643c13…

MALICIOUS

PDF

84.5 KB Created: 2021-07-04 05:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 986de618a1bf126a5378f806825f3f70 SHA-1: f4efb8626421307712eaffbdd878a1a7f90a2a26 SHA-256: 98337fe1cc643c13c9c0c1412f62c17093f7f5398a8df9384a53bcd26f6cc6f4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis suggest a malicious document designed to lure users to external sites.

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://huntic.ru/uplcv?utm_term=how+to+roll+fenders+at+home
    • http://mcutech.net/upload/2021/06/file/16240963961170167349.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/s4klij97n9rprgougktk0f8qaf/sugodetesuviruvuxelo.pdf
    • http://houstontca.org/Content/uploads/files/bifuzesefepewujiwedomagi.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f3de5aacbdd11190957894b58897519a/65820256402.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5f758124f44d59aef13c3f799b6a4f0b/90993934188.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/fikilotinixivejeneri.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4e16b36d875daf763031303695069853/xupibinosawosawaru.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924430cdd56---2199031717.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5b9e8332---zilalaxuvojupigusabuzopo.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160868bfbb8973---14171903333.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16a0def192---69082359320.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/12d749bd2fcc4d0e5e535f19c72591c6/woxep.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2df020ddcab823b8e157a44db4d72b09/geximerig.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f14cb29651---dewepovedifo.pdf
    • http://a-kamen.com/userfiles/file/8877462923.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b968dfd68---4654664504.pdf
    • http://pk.mo/userfiles/file/26199577539.pdf
    • http://accronline.com/userfiles/file/jimupilekikowava.pdf
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/tozexiwifumebil.pdf
    • https://beauti-full.ru/uploads/files/lumomotuxukixitudategafif.pdf
    • https://iwanbim.com/userfiles/files/47954974934.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/dd7ce9459a429fc3e5d3f1fd2ecb2355/29835924244.pdf
    • http://refpecsbelvaros.hu/kepek/files/69123932448.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_off0000e602.bin
c50a5346c382c9a7485df44a2686ed8474b521dbb8e32daf1701f631f6d484da
pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 10604 bytes
font_01_sfnt_off0000fe14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 16792 bytes
font_02_sfnt_off00011626.bin
1672a1baeac0b09b2b60e363c92ce7fd8c4fc1d235e21b6e9f8f461955532309
pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 17244 bytes