Malicious PDF — malware analysis report

Static analysis result for SHA-256 c072632e26f39726…

MALICIOUS

PDF

97.2 KB Created: 2021-09-22 11:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed760188dee19c973fa5231577fa4a0b SHA-1: 92f01004b752617ef0d8ec022e8eb0d26176ddf6 SHA-256: c072632e26f397265601b065533420c5d0e29c5159586d0f1e668e9e59bbfacd
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://ristorantebiscione.com/userfiles/files/23478279537.pdf
    • http://quantri.thaisonpalacehotel.com/upload/files/busomexefexevepidugi.pdf
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/45748812504.pdf
    • https://onutglen.com/caningest/images/file/65852631685.pdf
    • http://4998horo.gmmwireless.com/contents/files/98038489690.pdf
    • http://vodnik48.ru/content/file/80992727838.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210918_9B930862AC88B2C9.pdf
    • http://seattledesis.com/fckeditor/file/83526162066.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/kefatenebibawasalunu.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131914f0e7ac---tixirazokolavulobikafa.pdf
    • http://mercuresamuichaweng.com/admin/file/84765016678.pdf
    • http://alibabashipping.com/userfiles/file/69449851022.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210921043346.pdf
    • http://khamranghaiphong.com/upload/files/lomosixakup.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614076abed355---kimusa.pdf
    • http://sourceandsecure.com/uploads/userfiles/file/vosifotijemuge.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/03c76e28dfcf37f3b6834f7eba0660ad/76102755393.pdf
    • http://sbairs.com/datas/files/63037089267.pdf
    • http://www.guus.edu.mn/ckfinder/userfiles/files/11558489583.pdf
    • http://dralituncer.com/userfiles/file/tigevabuxavoputozazimi.pdf
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/88859675952.pdf
    • http://grabnerestriche.at/69641962166.pdf
    • https://chorland-dining.com/webroot/editor-uploads/files/goxugomupozinodovufogav.pdf
    • http://st03.it/userfiles/files/lazafen.pdf
    • http://ibookingkr.com/FileData/ckfinder/files/20210914_1470F183BAF5F598.pdf
    • http://yuemeism.com/uploadfiles/files/fuxulufudatoselow.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+app+design+online
    • 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_off00011718.bin
c31c118e2a75410da93320cbd7efb490e5559bd6eee1ba8c087d4d18934982dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 10452 bytes
font_01_sfnt_off00012ea4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA4 16792 bytes
font_02_sfnt_off000146b6.bin
f861a1f79f7edf6a054903974967eeee79e3f428b524e1b78d13efd1f10e2954
pdf-font-stream PDF embedded font (sfnt) at offset 0x146B6 18492 bytes