Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be53734c3636e71…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 00:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c96ee9854792e8e4e84b57a8adbae48a SHA-1: f1f9d426065dac827a37a68d7fc0bf8652cebb70 SHA-256: 6be53734c3636e71acacb55a067457b32cde3c22127faad6fbdecd0a16ef27f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to potentially compromised domains or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and numerous external links align with techniques used to obscure the ultimate destination of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/97263820100.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160941336732da---tagedejogutikopatas.pdfIn PDF document text
    • http://sooclose.eu/upload/File/viwemasuwomuzudo.pdfIn PDF document text
    • https://telenovella-bg.com/files/27695736119.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/kobumugenefalola.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/sutovodo.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/32030314832.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/sukezovalonobapokopuvuxe.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/vamefogizemef.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/47852453616.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/zovoz.pdfIn PDF document text
    • http://proxima-design.cz/files/file/mobafefaxuzebipulibi.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/79682001589.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/37983516312.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/xadaxuderefitilakin.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091be305c410---zitolokemubajasowunu.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/91677883036.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b575f98673c---40488149041.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/54242718711.pdfIn PDF document text
    • https://dineflon.com//files/zirozeruropijup.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/fulafuvipofasazusawixaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=rotate+pdf+pages+shortcutPDF link annotation
    • 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_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 19184 bytes
SHA-256: a7711657fed479f9bb5e71149518f385587b63697c33abcb465c417ec2f7b7bd
font_01_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 10804 bytes
SHA-256: f04dd57e07cba29cb3e3c6d48eff1f2d54258fa9ae9bfc9e14c5668314800c65
font_02_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1