Malicious PDF — malware analysis report

Static analysis result for SHA-256 395fa3ece84ea0e6…

MALICIOUS

PDF

73.7 KB Created: 2021-06-21 14:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d0bdeac5c23f105e7945c181bf69faaa SHA-1: 72517fbee451d6809299840ddcf71001b7099146 SHA-256: 395fa3ece84ea0e61a228d34ddaf01453ea40c43293831eb0cc94ccae8be9820
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the structure and numerous links suggest an attempt to manipulate search engine results or redirect users to malicious sites, aligning with a link farm or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 https://nomylo.ru/uplcv?utm_term=ukulele+over+the+rainbow+chords+easy PDF link annotation
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48ba7967b---kodilekumanepewiv.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/duajbcmj7brlotg4r1b262v9e6/30522197648.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06ac29fd67---6307386602.pdfIn PDF document text
    • http://com123.vn/uploads/file/botiko.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/3442303571.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a757ca7da0---51323974882.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4aff148c---7075860172.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/86361139776.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/5af1a1f1b54c4b7fc6e85baf82ead794/sumitabezetaxaz.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1619bce1ea9cc4352596c72478f2826d/14476097258.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/m63uanp47ea54tqshfqolbrmce/siloritolaniv.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/negefodezewozowilaletusom.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cd9c1ee8c2a4f600bcd5d186a89be2c9/38900711476.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/42602255913.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b1b08988889d8487c0ce9e66ccb65ebf/tosubozepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 5476 bytes
SHA-256: dc49976ef507509fe5dbc53070bb94cdbcc5edbf9f5d9b2397925fdcde651c50
font_01_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 12064 bytes
SHA-256: 102d230e50762add8691189fc425c38ef29cc25824ad1c0b723ad1530ce6e7d0