Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07dfba8210ca0c9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 04:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bf71dd2140d392e2b89db01f29e7f44a SHA-1: f21fe1c3a24fdb67e01dda48e2f5fa91ab558add SHA-256: b07dfba8210ca0c9c2832961092ffc5da5164eadeb14b45585497f3c0f9ae404
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krafteco.ru/uploads/files/21716058359.pdf In PDF document text
    • http://swhos.com/upload/files/97722826977.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/13473038974.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/30842310262.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/puvarisukalupenuxon.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/81786182413.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vrihv6cudgf25rvmo2doaame0q/ziruguwobazudukokiwusoxiw.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9ebba1c59d458ad00b44ba68855772c4/82732336866.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/bitulov.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/23187619402.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/durijorowutalawupakap.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/95610054616.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/dubiwiwixujem.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/4215857582.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/texavu.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///niboki.pdfIn PDF document text
    • http://charontrade.hu/data/file/24902862358.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/84289856385.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/zimovozusugenopugumunewek.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/dibagakefasizilebuxepa.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/timonofibasoxogare.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/9608512531.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144050704a2f---66492339079.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///96975185073.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/58500466750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+mp3+music+playerPDF 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_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 17872 bytes
SHA-256: d8863e400a7f6d5e33adc04cac0224d875b745d5a360b845297b5c994276aa98
font_02_sfnt_off0001236a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236A 10576 bytes
SHA-256: 6f0efe38e0daddf942192f539d9cb6b2b1b2741ac3f8ac2b5b1b81709042718f

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