Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3666537093c463c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 10:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e31b09639f70b7f42dec3c587e3c3b0b SHA-1: 1c073b27e3b76135116d928a5b4570a60a598bdd SHA-256: f3666537093c463ccd3eab803f8ceb8d03e42d8d7676f39fbdba4e538766b9f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document's primary purpose is to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://allytemp.ru/uplcv?utm_term=keep+hotspot+always+on+android
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/gakixiwomodipuse.pdf
    • http://packamate.com/userfiles/95989853414.pdf
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/pebejinomudojavano.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407a4c6066e---posatid.pdf
    • http://jolanyee.com/upload/files/202109151609378851.pdf
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/sagatotizefiwaxoxudogim.pdf
    • http://cheumst.com/upload/fckeditor/file/3012007566.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/vilanutirava.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5e7eb811---54964557812.pdf
    • https://fivetc.net/uploads/files/15380389595.pdf
    • http://tandartsindex.nl/images/uploads/buwutobejizawopazelad.pdf
    • https://s-serviss.lv/userfiles/file/zaxodofo.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/xudarakasitila.pdf
    • http://hide-bo.com/img/tmp/file/sewujejogudomugosexu.pdf
    • http://tonghuichem.com/upload/files/78885465542.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2a92e0e5---42605783413.pdf
    • http://khachsanmyngoc.com/upload/files/dokofosudasusuwatewevux.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/77019611382.pdf
    • https://5703n1n6999-6a55.com/contents/files/pamuzijuzat.pdf
    • http://yuhenganquan.com/userfiles/file/20210916060606_1658334043.pdf
    • http://bakineshr.az/ckfinder/userfiles/files/26513213331.pdf
    • https://tradingcall.in/ckfinder/userfiles/files/taxibumewimusu.pdf
    • http://studiophotosfashion.it/userfiles/files/56560055455.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_off0000c187.bin
1662dae79e7be235aed397b838c770bc28d61e5b839bd99237fa969ae4d52298
pdf-font-stream PDF embedded font (sfnt) at offset 0xC187 17988 bytes
font_01_sfnt_off0000f129.bin
46a8bb4856d2d7d268fd83b5cc863aba7b7eb648f9784de2c723fc9c2d0363e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 10680 bytes
font_02_sfnt_off000109b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 16792 bytes