Malicious PDF — malware analysis report

Static analysis result for SHA-256 32e2911e937e15ec…

MALICIOUS

PDF

79.7 KB Created: 2021-08-31 21:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3ef6d5b3bc9491468abb7533f2e9c89 SHA-1: 78a04b6c7b243bace6e22e7e301272e7e4a21a17 SHA-256: 32e2911e937e15ec9df5e0c9ca5adcf0118df49c575d16c8a18db223ec85f5ed
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 CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=m+tech+distance+learning PDF link annotation
    • http://adhunikjewellers.com/ckfinder/userfiles/files/37296508044.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608567ea45c83---341000056.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gsb4ql9sf3h18vbfcffj1mmgn9/japodepaba.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/ludagogotumeke.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/76585328908.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/pofawepogagobamazunububep.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/jarebapejaxex.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b94da1253---82679467534.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/11521298297.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/7196044413.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/kakalo.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/64683777237.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/cd70414df44c96846619aac76e64f9ea/11059055235.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c2e699ec4a57d15b6017959d817d41f9/jotabanawidekagowaxupug.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/dudewilek.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/23161591260.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/64090745277.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d76221e5a14483aac3501aa1028b41da/navuraneveva.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fcf8b1b0e4110522dec930e3738caf58/60180495133.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ce72c68844d---lowukuzowosadagawugenaz.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/44991228806.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0099a27b0---3590781235.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_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 17704 bytes
SHA-256: 06401e747dcdd45e02fc84e7eeb24cd51c3aa65ebf75b8d7de0078eac8743a0a
font_01_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 10520 bytes
SHA-256: 402c0be8832f5c052f2e3a4b22031077aadaa3e8a9cdb589e06a35ec5ecdb270

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