Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7f52f3cad87419…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 23:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16ede2031522cf3afb186d28b6be3d40 SHA-1: 9f659024d370c89f8e3b0eab706317797cf049cd SHA-256: ea7f52f3cad8741964c573d3d18fdb29da49364e45db62634ef929e62017e4ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains or compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the overall structure indicate an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8943

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://srutimusic.org/userfiles/file/xemajugej.pdf In PDF document text
    • http://www.peretprod.ro/content-images/file/fimatemosomagokuzifezaw.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/wiwomoduvisewopuvij.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/mibezuwelodibazelak.pdfIn PDF document text
    • https://iword.de/userfiles/file/27999537292.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/14463811924.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabbc15a85---xokerisuxinafukujixebuxos.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2df70e28---70944616007.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/22327038991.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb4df38ec08---jipadipan.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/52225037360.pdfPDF link annotation
    • http://czdashan.cn/uploadfile/file/2021062621540173499.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a8624464699b0024b6edf0cf65205e21/pewavir.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///79759407639.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/281016472157.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/35841926565.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ilk0aj7pmi5jbgmk93q8rid7s5/muragugojemenodoj.pdfIn PDF document text
    • https://asiapharma.la/files/files/68832429429.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hh8eb7s8ctln0n59759r28rb7n/89169439354.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/48408793534.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/88667d1f893de4274f05e1c8f6cc76a6/6339107957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ascites+drainage+at+homePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 18244 bytes
SHA-256: 46486eb0127edd69cb251b2d8f980519986bd4737e68bc9dc6f61361066bf47b
font_01_sfnt_off00012afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 10752 bytes
SHA-256: 3fd7fbeb53933099c38658beac1a6dbe48d65f3e98e82ccfcedcf80f0927e752

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