Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87b2cdfa6898085…

MALICIOUS

PDF

91.0 KB Created: 2021-06-27 12:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fcf92dba3e78a70d30e51546f8323178 SHA-1: b0cd2ade0629aa02330e2cd4c33afc983a6d78b0 SHA-256: b87b2cdfa6898085de3330c3741447474b46b9ae9dbdfc4627599136ff809c08
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 WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed68901a8b---pijanize.pdf In PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/b61g52aacg7oesg7djqs1om62g/44423449436.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a62a955c12---sofijizofivurun.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2ffc48b895b36042a7b809bc67b6abc4/wexemefiwoputigaxikev.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8396a0d83874cdacf0d8c63407a2898b/buxuroj.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/480b512957d6da24ef460999fb4f74dc/nonasewidilewemebopijuj.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/41738798890.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3bcd6f026---5509895735.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/vibun.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/98938269709.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/8ao5bs56qd9bumq985380o56p5/fugixodixunamalir.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/jinozugekosuvawixogovi.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/797de1eaa34eacf082c4a407d2fd4e84/gofemowizum.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/97104311533.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/risifiva.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/32572568424.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f193063fe11765df13c32a4bfbcfe3fb/rexulavaxumerapi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/371a883a7801df7c5ba8ba46f51ddef9/gerala.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/fijupigofojeruxarikijer.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/gojikafo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9nmbhvejfucp7h2b3cb8335rc3/81384174335.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083519bb4e89---53543750044.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b989dd2f8e---9793763834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sure+as+heck+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ca3f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCA3F 18920 bytes
SHA-256: b52ce0b6dfcbf15e570070817541abaa8fb096c7e87c54a8f70e20689590c8b7
font_01_sfnt_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 18592 bytes
SHA-256: 8b098eeeb60f559ea26af8b203890b03f69aef75315edb85056873ba40d4c21f
font_02_sfnt_off00011a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 10680 bytes
SHA-256: 3333d451d622ffb4d93cffbda4cd3d349d840128e99e3fa05e77cfbd39ab67c1
font_03_sfnt_off00013278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13278 5124 bytes
SHA-256: 4ae27b956fdbec6f9c9b44442b273864401a3b046ec2a4a007b58cdb402a7e4a
font_04_sfnt_off00014444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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