Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d04e8380ed5443…

MALICIOUS

PDF

76.7 KB Created: 2021-09-21 01:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 357982ff5cff17151a8d5f610a77d605 SHA-1: 7c1a3a592d20d8044ddc64dc984435f91b94fbca SHA-256: a1d04e8380ed5443bdac34a06b62113fad4d20c8f5431b62e447ffa709ef6149
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also features numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de639eeb7c---menekazubadumesivogeto.pdf In PDF document text
    • https://loyallcanada.net/editor_files/file/nubewapefoxafasoxakeguzu.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/36776574842.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/84301445967.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d39799a23---vowadop.pdfIn PDF document text
    • http://nensi.si/upload/file/vikoxefute.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613212e47e4cf---59235127918.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/41308135609.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912185839248408.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/52858955730.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/besixujigiletop.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/82907873720.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/2fgie761533gq2uffjem8p43ug/90758210248.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/renuzodiritixepodotizem.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/kekofovitejadelolakule.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/zegevejorobinomituvoga.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/jelubi.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/41475873784.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/tulilatomor.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/vexitivi.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/pitoribu.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/63290518052.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614194db15e4e---78626919132.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/47976580939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+walking+dead+season+1+android+downloadPDF 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_off0000c96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96E 16708 bytes
SHA-256: 778fbca4133a9c49f43e3775efcf7a57f1c96f716b06013e6fd7dfe641daae8c
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 10620 bytes
SHA-256: 42eaec9aac5560d555db691aabded0c1aa27e09db18be2e7660ff3e74c69c2ce
font_02_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1