Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7999794495ec8a…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 13:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45ea1d799bf126742403ed7c6a1dc546 SHA-1: 6766805c2d348424860b9b5a84cdbbca9323bb72 SHA-256: db7999794495ec8a950351656e54ef38db06890973a0f6f20ed444c9592696b2
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 numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware payloads. The presence of external URIs and the nature of the links strongly suggest an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=plant+move+towards+light+known+as
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094db3438f5c---wimunofisifuzibarikaf.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/52455b5f06baa394ccd43cf9f31a0402/13518417191.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/236e05or2o3vvk3rdda50tsf95/55383302564.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be7d47f3e55---69470343166.pdf
    • https://immobilgold.com/file/95975058004.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745736ed5dd---zoluwim.pdf
    • http://adveotec.com/img/file/pimeviwewad.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a115d781438---dinowujufeg.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befe52a0038---fefofidunagozetibakerazib.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081325e727d5---dutur.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914e1fa1b9e---98811153609.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0490dc543---21187302552.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/j54dc336m17d3fvobphp30shhc/71136295376.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c74d6a7e8---saxisikiwad.pdf
    • http://seoulgreeter.com/userData/board/file/jezatuxas.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c1f7b03e663a72b08704edca7b5d85f5/56295427635.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4a594a9a674865c3bb50cca6d045c7c9/doxadobajuzepefegebe.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e09e466848cb053269d85cae61b79dc/vozorijakozugawuf.pdf
    • http://forglass.sk/userfiles/file/68975175005.pdf
    • http://dbhsreunion.com/clients/21010/File/90164494278.pdf
    • http://gourmethousemacau.com/UploadFilesfile///79774611509.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e172c477bf64cc0b7caa8f7d0016d16d/97386918554.pdf
    • https://airflow-skateboards.com/upload/file/peratatovejub.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a78bb94467ff9990cbe2b88fcd6d296c/28645057118.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab21724b0eb---59059093911.pdf
    • 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_off0000f0f6.bin
c76e9dc121fd16c0b12cba7a859340eae8cf6756b577adbdcbe8752b573afd46
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 17080 bytes
font_01_sfnt_off00011da2.bin
f2b790caec38006e72178836f793f240dc19f6b2856acad967fa9e8aeeda0c4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 10940 bytes
font_02_sfnt_off000136a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136A6 16792 bytes