Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e7f4aa1c6a4e81…

MALICIOUS

PDF

85.4 KB Created: 2021-07-03 01:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0559151c300d17258799543386283252 SHA-1: da500d1e3c6c993a4eb4594098f0b543f6b1f780 SHA-256: 93e7f4aa1c6a4e8116e81be0729e1f59b8d44032dd3017464460921d94f449c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many pointing to compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://cructi.ru/uplcv?utm_term=quotes+about+jealous+family+members
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f14d84f76---79997605376.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5c0c19ab24f3a2f4257082b331e97623/37886728571.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160902a93386af---33609280172.pdf
    • http://huntland.hu/upload/file/pivoregugago.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/94a84d0f2047d621574b54aa5d82ff57/neruvubidolapofisatigo.pdf
    • http://podiummoda.ru/userfiles/file/99211446770.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160738f4f21c7d---30477968376.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/9t8orkjvesuli57to1uhgb3rv1/banaz.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160904af5d2e2d---81881319504.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9646fd7ca4ee226b64bba7dfbf22aab9/biberomoxi.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f69244e321---19312139058.pdf
    • http://belhavenhighschoolalumni.com/clients/13962/File/bizapubu.pdf
    • https://tangentemag.com/img/file/lejetexubop.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9701b049---442697415.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160969d0c272f4---kiximetofeguzogetiduzi.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088577e8da7e---74772273209.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95f7e37d6e---mazisiwivajir.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a193b3f2bca.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16081e3661f12d---52177392101.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/26a71b7c91f4d823404b2ea6556f2a1c/ketovo.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608817682cb35---lenamo.pdf
    • https://radmangroup-ye.com/rgfiles/file/64922096696.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11a691302---bakime.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_off0000e9ec.bin
73cedc9056563167cfedc23737f7110bb693192ae763a9fd5e180f87b0900c5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 10812 bytes
font_01_sfnt_off000102fa.bin
eafa3317fe2735a9a3df112bc61f085ec8e998cfc44e4a01f2bbec293f2dabc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 17400 bytes
font_02_sfnt_off00013050.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 16792 bytes