Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e43da3b6963a73…

MALICIOUS

PDF

92.3 KB Created: 2021-08-21 12:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 02d1a44f5d6364e7054ff102edc2b42c SHA-1: 1b80fd0b3a08bc0f8be492ffca78eb9fc2d30ef9 SHA-256: d0e43da3b6963a73e87eabe7aa38acbb8525940c52694748fd77853440b7e4cb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://coretry.ru/uplcv?utm_term=fundamentals+of+heat+and+mass+transfer+7th+edition+solutions+manual+pdf PDF link annotation
    • http://safarang.com/basefile/files/madajedapotedepadijatazu.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/gonim.pdfIn PDF document text
    • http://chinahongji.com/d/files/65144801191.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/pogekalukepo.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/26408064870.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/tevujexoju.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/cd2980d657dddc6f9e8a95453b33c55f/rodegitokazefamapoti.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/c44b3ed282c54505b61a6b8c3a1cb25f/towipuwekonelitex.pdfIn PDF document text
    • http://sireny.net/share/files/81253503432.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/musegitatafizasu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/f7574554dfa847ce36eb140c7fb4de36/diwefiwoxopelitu.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/lokolumil.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/liwokogemazuwudederasuno.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/32826406603.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/boxogufagixo.pdfIn PDF document text
    • https://ahha.az/userfiles/file/38070691294.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/aba5a31537b32a68b2063cc2c4dbd1e7/91590255403.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a910d7c83ec---19289743581.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/buwaruponi.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/dolavewo.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e5a4e5a7ffc70ecd2745669d6e91d9f6/23712380682.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/45816241311.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/38852047323.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000124e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x124E9 20672 bytes
SHA-256: 151fe55251e190cbbdb1a34aed1a1707063edacad1216b8d1f182f973be73f7c
font_00_sfnt_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 16236 bytes
SHA-256: 4ec4c41c886e726fa46da1152441d2305b995b1e84d53fba0218cc90d2c99a15
font_01_sfnt_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 10888 bytes
SHA-256: 5eedbaeba00440c8b445d19768f0f3cc247df7ba3783c6dd9e027474f1656dc9
font_03_sfnt_off000147dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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