Malicious PDF — malware analysis report

Static analysis result for SHA-256 4630ae8c9b7c2995…

MALICIOUS

PDF

84.0 KB Created: 2021-07-24 16:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 547c30276adbcf8b025344e1c30c5d47 SHA-1: b23d7e20be2872395a24ba9a0754884c545ad091 SHA-256: 4630ae8c9b7c2995ce6920db33b381a1e0366df5af1efe3a603221c1c70e566f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external resources, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or redirect users to phishing content. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5s3qp4260eiieujogae1fc02cg/12839907285.pdf In PDF document text
    • http://afgventuregroup.com/cfiles/file/35238755970.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78906147e---72238395275.pdfIn PDF document text
    • http://sinoorchids.com/image/file/regizagajofejumaxazeg.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/vutalinezovijevurevabe.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f8c52833a8d4529d1612c0497be29eb8/3419663424.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/31c32bbfde20a90a22822e49f74dc267/vegaw.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/judupojofazokenusi.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/13ef0eb06e3c4825d148bd70e5080d66/gusabu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9f38d29d06d870a6a6707b1d456f54d8/tajof.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/napatidoseka.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/28737777502.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4acc83a4d---8577684693.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/65918860404.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/sijimebuzajafasin.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a32b54e5b0c8caf7115bb9bacab07d30/48955702720.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/4493119280.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608101a29df57---33719106932.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096699644bef---49799848433.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984cf1a0eb2---40099438549.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/samojerejukamizabira.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/rejuvodalilazakalas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=1975+6hp+johnson+outboard+motorPDF 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_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 16732 bytes
SHA-256: 1e2b41a46dfbeadc89dca73d853709c7d60fa7b4827e52e97378f6785530cd48
font_01_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 11232 bytes
SHA-256: 8b69214f1f4651ae28079dbd4b830d4588314416749388e25595618da1c6d013
font_02_sfnt_off00012a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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