Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dec76ffee1b99e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 16:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a5acebcb9063ad29474b207f71d087b SHA-1: 370fba6fc15302ea4879509fd07b19898d7bea1e SHA-256: 21dec76ffee1b99e26e6606627266f79360cef2d1a93486bbfa93d3fd3859280
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, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073576866b01---54242337359.pdf In PDF document text
    • https://peterdegendt.be/file/46929872354.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3e78797c2526ddcfa6831b9f6ec0276a/24853696483.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c9f05c90e4b3138fa43a3c9174553c41/fewakoxepidizobudemup.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/37956565505.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/tafozuzafaluwidovulirodi.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/26350844586.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5162217a15---lexexabepixu.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/2762bbd091932dc48a39272e69c3b210/48863784228.pdfIn PDF document text
    • https://ms02bet.com/contents//files/nimezudedelajira.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/33497426046.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/35092507147.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/jerowuxaparalemexevixave.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a067e024087---matotefomixasu.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/kupuze.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607586f372968---wozabazelogosib.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/jibifulitegilojo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gbs241817o2ovifus46j2f6gj6/veganesojotexudil.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/sirovaxagivamiwul.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0b3b950ac---fixamelivoxulezukiw.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/46460117074.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/figibiditin.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8bd1f35d4---46788406668.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7eaumsdpi39nt8c0vvqccfeikv/73738125260.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/4134812842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=quadratic+graphs+worksheet+ks3PDF 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_off0000c1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DA 11152 bytes
SHA-256: 9453253da0d52565a0be574bd93535fdf34e464dd9144981835fe4901c0ee5d0
font_01_sfnt_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 16748 bytes
SHA-256: 71519538ee42086aebde8bacac0b74c5ebf6c9cc9d3a2dfe73c10ba91cd4e93f
font_02_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1