Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8771572b5bd6eb…

MALICIOUS

PDF

88.3 KB Created: 2021-06-29 11:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e364f6e99bc4e05728880c50bd9c137 SHA-1: e22b046b76477dcc2482b79c269b98bd3e24c3e9 SHA-256: 7b8771572b5bd6eb50f7387cf3b400a147350d3d83bfe6f6fd88dac1c823fc16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3455fa31---tavifudanapazokakasurad.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dca15e993e---sudutovexoretoji.pdf
    • https://scriptdd.com/_file/file/60082539767.pdf
    • http://ck-kutnahora.cz/gais/image/file/wejawubemukukegonafis.pdf
    • http://lycee-elm.org/userfiles/file/7305485415.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbe52a2b8b40cc950b0c60c748174c48/pigemotenebagige.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6b1c563a8---48557630943.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160788fbe3f900---73306630640.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7sb1u1g9rh5judr6ecoruq68ot/61295632909.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/fc39a671fe0a3ff2739d7a8ebca9ca0a/wajozamaputilazup.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/jawudiwabija.pdf
    • https://asiarsolutions.com/userfiles/file/rakukijisak.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/67465243430.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/26988463594.pdf
    • https://hgb.se/filer/file/vonaf.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/74948810386.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/45447221399.pdf
    • https://alice-immo.com/userfiles/file/44295017947.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075244c21873---84464022307.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd433a1b34---menusedaziwugoxukamo.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/735add14fc83ad868cb05ee25cfb5a96/94296926813.pdf
    • http://charontrade.hu/data/file/ritudutiretojeleziw.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086358ce0e63---fezavuvobaregeverile.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63c80f4be---82330637040.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sell+goods+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d8.bin
a1f876d67d810e7c0686af77cfbbdd4d597bfa263007cb59d74a680cface20f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 19164 bytes
font_01_sfnt_off000124a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 16792 bytes
font_02_sfnt_off00013cbb.bin
55cae673aa3d4096e2b1ed500f91141dc6e8322637880561fe346833cd79fd0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 10468 bytes