Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6337faed0e89ecd…

MALICIOUS

PDF

77.5 KB Created: 2021-09-21 00:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eae68b0a26e2fe8e3bfe01e642ae3123 SHA-1: d99e3bdc0ee08c055c1e2a948ee1edb06f91b711 SHA-256: a6337faed0e89ecdfff3a6c1124db2b8e1422ee82487c327ceff3e89fd952968
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads. The primary URL includes a 'watch online escape room' term, suggesting a lure for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://drafthe.ru/uplcv?utm_term=watch+online+escape+room PDF link annotation
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da24af16f7---57782398966.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/totajoduneke.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210901123204699.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4d0d2804e30fc66903cdd5e8a2b62305/nujifegew.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/radilejegiforudalur.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/3924335671.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/asc0hrelbgkjeiekcsp488626l/3248524087.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/gewipovimara.pdfIn PDF document text
    • http://zamgph.com/uploads/file/090528544706.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-9-21/20210921051636655253.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/wumebekopebatefebe.pdfIn PDF document text
    • http://geose.ru/userfiles/file/15956177141.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/zidiloripoxurabusepadowo.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/7250770578.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/wadejezij.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/komawovevawibawop.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/mewinuvunap.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/35284479715.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/81531562574.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/bedaniloruxujevumavezid.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4c709f7e1f4ec654d019326a568f27f1/53280348149.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/vomomebopib.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/24372747062.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481bdf7ba1d---fafewuvutavaxaforir.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/sawasejibi.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_off0000caec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 17340 bytes
SHA-256: e5d243b2116e843d8dadff961b4162f47e56f4e0c374d30c011cb4007a9464d0
font_01_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 10632 bytes
SHA-256: 7708781e3149adcd8f03daf9bd29d97d5211fc3ae7429866774148bd39bf0d08