Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94a181e01312d03…

MALICIOUS

PDF

83.9 KB Created: 2021-10-20 10:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 75f36ebcbfedeb7ce71e8eee08af4d03 SHA-1: dba60e8a1ed12fdcfcafde5efb5e3053b9f6ce7c SHA-256: f94a181e01312d031f240c35fefbe2f1d677c1eb91cf9718a1b994ff8ec9e6f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://evevoyance.fr/adh/.-/file/samuratogalofoxelogojawol.pdf In PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/94031396872.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/manopibofodejodejojagi.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/52780106344.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/kuzexikukazojasabigelizi.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/zidovadadifagaduz.pdfIn PDF document text
    • https://quizai.com/uploads/files/96041095427.pdfIn PDF document text
    • http://glendale.kopanramen.com/uploads/files/125364076.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/22045642046.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/95225125517.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/wizinagabesadubitomekuxa.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/77214663663.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615145a0d2ea3---kubibitulipakevakajiv.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/pikeluz.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/nusemafotejezejale.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/12778903812.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/1429430994.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/kuwidukuwogedubikup.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/51738696745.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/18314064800.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/palidotovu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8906483d9---tebotexipawepomofuxata.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/24848203581.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f352ce57b9---9389278757.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/9a07b527ee2080ba900f8311934849b2/51795975808.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e99db46df---davarexotezosa.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/tgwjJlsMqHc/uplcv?utm_term=the+african+origin+of+civilization+pdf+free+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_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 17336 bytes
SHA-256: 3b04a85c402aa4fc7f12c893e29331d268d04868458e6fb25c32ac2c26ead46b
font_01_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E1 10908 bytes
SHA-256: f6291e95ef93d750b7484de9427611ae1da45c8ab5adcec1e3f4a86b2ff63645

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