Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1b3ae24b092772…

MALICIOUS

PDF

87.2 KB Created: 2021-09-12 11:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8a0ba096f10958dfa034abc03f721e2 SHA-1: fbfa1ee56f92cefcc325770ac363bbb3b18a2f20 SHA-256: ce1b3ae24b09277276bfb126ae8732a7ccb6ff7b7f47e98def81009395745f42
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 compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=gta+v+2.00+apk PDF link annotation
    • http://zdrowejaja.com/Upload/file/11299877927.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jalupezomen.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139052f6b1a1---99392324038.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/wijodeba.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/giwudelovidufofuwoxukipo.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/bidowukirajirawesifimerig.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/96183597822.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/laromugebezufupimedes.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/51610060894.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/zumase.pdfIn PDF document text
    • http://apcmagon.com/userfiles/zufigetisezaxubopesegiwad.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/bojugizumofotixaxutamusaz.pdfIn PDF document text
    • http://sushibelovo.ru/files/lexuwosuwopisepomot.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/sufenuxileduxo.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/mudefi.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/lukolojalesuli.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613035611914a---fuvatelifawazepega.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/29410453967.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135054781f67---vasevexijuropajamezes.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/poderoxarav.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/15416469530.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/98235930141.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/duzazogonaputofab.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/wotezizobuf.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/kelulukeke.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_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 18100 bytes
SHA-256: 79976d195a372fb7500ab25612f7ffc6b5b3bc5c82505d4270b87cf8eb4fff67
font_01_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13989 9988 bytes
SHA-256: f5d75b7d7a4ede33e4434bb37829e7f8acb4b6dc3d9b9ef99427c1f3c20241ca