Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da0f9cbd2f59616…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 09:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3a4539abbc6031a15d30d3e030a9efe SHA-1: 006950c30f19464dc8a8f1571ddd93efda3c2b87 SHA-256: 9da0f9cbd2f59616c691cc72944d9389902a321de66c047185457e4c64fa812d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and contains embedded JavaScript. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm, directing users to various URLs hosted on compromised WordPress sites and disposable domains. The presence of a 'Password-protected archive handoff' heuristic suggests the PDF is designed to trick users into downloading a password-protected file, likely to bypass security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=pok%C3%A9mon+omega+ruby+3ds+download PDF link annotation
    • http://topmebli.com/content/xuploadimages/file/vozodimixefatematoxom.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-14-05-01-17-62.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140252e0303c---rezuwatozunesovabopev.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/70vdsb8t7fp7mtogojgmh7a8q8/45170063734.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/60743846432.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/kuvenimewiruxivojibugiw.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ba476ee8e26dd962fa04b1590e501761/kutuwuferejeniz.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eace335e99---sinajinotubo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/411fffd0c0a6f9583b9e3c9a27604fa5/jezafikiponilovede.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210908152250519718x7h96.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3jrubb4edskasveept68h7p0o6/zokevika.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/47115806172.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/20280571715.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/lebifemanabod.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/73956173109.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/nabakofojid.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/jafavukexexe.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/nufusebemilipamoram.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/17528135174.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/numome.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/12487710517.pdfIn PDF document text
    • http://yuha.be/_files/file/6002573897.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_off0000c513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC513 18300 bytes
SHA-256: 4f987d45c59f05a3e3d4e0657b0cbd2329c11e328a41025f6cfc77a0caec702b
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 11260 bytes
SHA-256: eddd1b2282d93e65edd796ee94b0d23ba956bc574347d580424c4972d605bb83
font_02_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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