Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f1398f1fdb3fae…

MALICIOUS

PDF

87.9 KB Created: 2021-06-26 15:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1ba80121f105acd4503aafe257058c5d SHA-1: e18d49b3b90779e214c8e5ab62a7e27bc679d158 SHA-256: 66f1398f1fdb3faed457fbaa4988bd3c09114f02de741eb2cb6eb4ac40f424f3
136 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of an advance-fee scam, using lures related to lotteries, prizes, or parcel deliveries. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the scam-related heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2b222a1f81bca4b17acb828ee351e80a/kepimerizebegevi.pdf In PDF document text
    • https://cecprint.com/images/file/67310664139.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/nosawofepabutavobobogeril.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/gunowetotamixolarisi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22760249b9---vitenelekitimoxigeruwaj.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb057bbf85---menuz.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/mmn1dsh1p7glttrs4ptr68lcn2/77775241421.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/18debb68399040182f7cad9282c80e64/21352468227.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16074278689373---88149830325.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/eg7udlse356mcrctigst8c3n2e/23689218516.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/af39ffe0220c85917a8ee1fe5666820e/xinid.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f04797a6ca---xidaf.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fa668c7f5---valajebijejapakinide.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/12c7f97e41197bb325ce5cc6321f8f22/59807082438.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/gepusepimapanajuninapal.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d4645340---66189750156.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/6de575d218b36da5f6b1592ebfab5104/jupozitinojuwetajaga.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45a379056e---wizuniw.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/sapivuvapawalozogam.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/korusokematov.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/lunijaxon.pdfIn PDF document text
    • https://orrizon.ru/images/file/vudupo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e24324068080e05e9790f47ed6d81487/zulupetij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=independent+contractor+social+security+taxPDF link annotation
    • 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_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 17116 bytes
SHA-256: 6c576410a81f284d6bf1d5a433caf62634a1909f8fb1b7c23a7c5d774388110d
font_01_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13971 10776 bytes
SHA-256: 428f737e0e5b92e2977361336b14c7ced4b48bc3d68a031c39e1c6b687aad2a7

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