Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea2b479f316cbab…

MALICIOUS

PDF

93.6 KB Created: 2021-07-01 18:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89cafcf75514d52a6841ff312b626e62 SHA-1: 6eb08c844c41e40f6a77f95895adf3dabe0ded8c SHA-256: dea2b479f316cbab78a5f07a4422f31e8c75003b845a2452b1280ee999436cd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mitcostruttori.it/userfiles/files/99293080935.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c868f098d7f---pixunalafafebib.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c777e7b15e---98390587570.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/bojuda.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4kea0ioc53rg5k544qqr5iib29/74359109954.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944a3e30d2b---movomurosobasifu.pdf
    • https://himalayanthailand.com/image/upload/File/8461984042.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/9b6b85810172c744c25aa96553415bac/51314623200.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/qg6qi7bh0pf48me7oo1oq7riht/39285068395.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f95131b93---rorowitinuruturepaze.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92a92a97c---fafileminovixojuvalepof.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d004515f6072755b6552223133ce5f4e/35377958402.pdf
    • https://agrimal.pl/userfiles/file/94780643418.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a94647481---35517079296.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc381155c7---xanogo.pdf
    • https://rainbowfurnitures.com/files/files/dijogenowefudapexukik.pdf
    • https://cakenflowersonline.com/userfiles/file/dixigejoso.pdf
    • https://aptitudeclass.com/ckfinder/userfiles/files/pabarowi.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3cf4d059af183d7758b574e79424a8ee/fewaduwosatabuxa.pdf
    • http://livelyway.com/ckfinder/userfiles/files/13781050346.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a3b14aeb---86027586775.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f17eeaf01---54367773874.pdf
    • https://chptravel.ir/data/file/fivisuf.pdf
    • https://commonwealthsportsawards.com/userfiles/file/tominuwozom.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795483d0362---dajowesozirawibujobesiv.pdf
    • http://makinsushi.com/uploads/files/buwulixojelekawepufete.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=classic+wow+best+pet+for+leveling
    • 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_off00010b87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 16792 bytes
font_01_sfnt_off00012399.bin
026b61852bd4c5f1f973f8d7eb227a0bd0470d384d49c4988c9bb148d17d1160
pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 16812 bytes
font_02_sfnt_off00014f98.bin
4d480a6c42d3763f687f7d0d950944b7903ba9d8e7cde71a6417a0bea5a5f1ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F98 10976 bytes