Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b190b24b69da24b…

MALICIOUS

PDF

84.8 KB Created: 2021-08-20 01:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb493edf18cc77c91c9f22ffd6912164 SHA-1: bd3bf122317f251d4ccfb8ec07300976900530b5 SHA-256: 8b190b24b69da24b55c194b481377b3b51770b4db60f6cc28d19ff5b9cee9fff
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and potentially disposable hosting. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b804519653a---92412202039.pdf
    • http://adamlegal.com/userfiles/file/98456504831.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/s2slo5hdcrja2mturl3o09nj3i/46518814022.pdf
    • https://triosms.com/userfiles/file/79782912661.pdf
    • http://efuturesthai.com/uploads/files/dixuwewexulakazaf.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/67624486812.pdf
    • http://zartmobilia.com/userfiles/file/20210725002605.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608e895121c27---28216884944.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/uad4c92lbfbi95du9fli9ol011/28577420373.pdf
    • http://www.aadhar-interior.com/userfiles/file/timesovifi.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bf8535de210d9b92551da1d575885c54/33314646176.pdf
    • https://zebcom.in/userfiles/file/pugedotosajoda.pdf
    • https://foodvellythailand.com/upload/files/vanutetivuja.pdf
    • http://safiorida.nl/operatori/userfiles/file/31911996426.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3c2894a6---6540847747.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0873aabdc82a6068fd7ffb7f31fc6a9a/48489132684.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5436b3a5d76bcaf15020a55a45738be0/11479044563.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9352f538---80663208349.pdf
    • https://stratasphere.online/userfiles/file/39203808823.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071f35f7f31e---xojipasa.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/94b847afa4cb4f00dc752c5635897b11/moxewerina.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ca8m43jttv40tfj8bcbim31aho/92052512369.pdf
    • https://samowar.ch/upload/file/xenexozof.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=deadpool+3+pel%C3%ADcula+completa+espa%C3%B1ol+latino+facebook
    • 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_off0000e125.bin
93c58b4e5cf7afa0bdc24651c64f262e99c8e091ffd1d63723b1aa60cec1c9c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 11456 bytes
font_01_sfnt_off0000fbb5.bin
8236fdf7cf0e139abe3cce500b6004f262521a3eb8f7fae0d29e1b97bc42641f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 18368 bytes
font_02_sfnt_off00012b13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B13 16792 bytes