Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37de91fe65e7164…

MALICIOUS

PDF

87.9 KB Created: 2021-09-20 08:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2cc8546b11bbe41d17fc45c0018164df SHA-1: 9b83f1295a20c9f205a18e62ebda27daf1f0d160 SHA-256: d37de91fe65e7164fe72ec4d85f3686a2778950167a37d22c3d65dab5598d92b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest it could be delivered via spearphishing (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=cities+skylines+android+mod PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613339c8268a7---muwafigatitotatir.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/49479110290.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/riwewoxofenejana.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/sujob.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/xedineteda.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/91139924983.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/motejitafez.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/todagabofajapuxopixowo.pdfIn PDF document text
    • http://methese.com/upload/files/poganifomuvudesudos.pdfIn PDF document text
    • http://beijingteye.com/upload/files/zopikokidotobak.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210915175746.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/67506795851.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/79759987820.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/89785511461.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/lafaworesogosefato.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/4560586343.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210902_023556_6770.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/judidizebuxirewovutimi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e9ce953c61e36cd2a4b8be2843b654a5/zovatu.pdfIn PDF document text
    • http://esistore.de/userfiles/file/8504277867.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/89861585652.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/24289676341.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146261f418e6---wusowigarixepokusigumur.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/kubogavugubibizilegetedak.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 10648 bytes
SHA-256: d8b036fecd71d2d0997bf36a75844a96884970b71d4d60055bce5e5bc0a9bafa
font_01_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 19344 bytes
SHA-256: df53b66461d0fe7a0f8933c0d1f6e747e1e3f6984cc30031cd73e28438a7d57c
font_02_sfnt_off000139af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1