Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b2ccdcabae8950…

MALICIOUS

PDF

90.2 KB Created: 2021-07-09 02:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28600f20a866606115792ef414f02b04 SHA-1: 210078a826778c04bda5697b5f2b9f5c0f4f792a SHA-256: 19b2ccdcabae8950374d3adb9af068d95e48f15f6e11452aa2154d67bad7b651
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://iwistw.com/upload/files/jupizet.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fef669cb7a463252f65a9f57da17f007/91341864888.pdf
    • http://adance0112.com/upfile/editor/file/menekunoj.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cedd353bb6d---56511823164.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c94521935e6---xapufadikere.pdf
    • http://cuatro-pr.org/sites/default/files/file/53915480473.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9a1670eda4eb65655657be15bb643560/59423417787.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kezurulusazizugisos.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/67f14fd16c360f089f188cf40dcacaa1/dupibuzovejibabuzumodanom.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9000f4f3---lixixar.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16083648f1b024---63539863186.pdf
    • http://alexhofford.com/temp/files/file/peguko.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/90f1cd26e210d25378b3500d1adc6333/13718020599.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/okp2fchmp6agi9t4aj3370g7pm/lawikuwowufipazufunewi.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/k463lmdpo4q218ii8irlu8fvio/penolisafesoxorik.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c37293be---sufop.pdf
    • http://sushiloverca.com/uploads/files/28359705921.pdf
    • http://kutscher-customs.de/gfx/userfiles/files/bovepofozuviremi.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1q51mp5uu4pmp18ua6tugpsj9v/16809802354.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210609054502.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/cbd0c0bbc15120efe86abdb71e405351/34831264706.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+answers+for+tell+me+about+yourself+in+interview
    • 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_off0000fc84.bin
edee83b655c3789e288f40658dd2333106d479a092aac8ecd5856941c687cd58
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 16864 bytes
font_01_sfnt_off00012824.bin
8cc0428d781f0f4924629468e53ea9d9b46aff342093e611a1eb784d70d4ee4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 10932 bytes
font_02_sfnt_off0001419d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1419D 16792 bytes