Malicious PDF — malware analysis report

Static analysis result for SHA-256 8433b279caf4f6d1…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 22:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b07f2c70f222ee62da0705f747ebd176 SHA-1: 524b5e66390762a49c0e7f98cc17a156321b6ce1 SHA-256: 8433b279caf4f6d15d64a1c8decc95c5290861146a4938f624ee882d50452be5
176 Risk Score

Malware Insights

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

The PDF document impersonates a cloud service to trick users into clicking a link. This link leads to another PDF hosted on a compromised WordPress site, which is likely intended for phishing or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://inwebjor.ru/uplcv?utm_term=onedrive+how+to+upload+files
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2522fdb8ca---telapaweziwolop.pdf
    • http://nexxosrealty.com/userfiles/files/linezepopaxogevomovar.pdf
    • http://st03.it/userfiles/files/9660966049.pdf
    • http://farmina.ru/uploads/files/50695210213.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6cde8d2a8223e2782702466c13306d52/52184343171.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8569cd97a---jodanigabi.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/sodawaganemof.pdf
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/tonutepu.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/cb9212050de8401f25383763c10b709c/lipumibakunoberivedibe.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2f0ada54a095cbd58c189aa3e2a462b6/55621816079.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb6993a698---losuwupatifibitakom.pdf
    • https://kingcarmotorista.net/uploads/files/62985885999.pdf
    • https://cooperspick.com/files/18722644932.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ca1fcf7ac3a422a769d54f6b463085e6/19458180767.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/55db8756f641488d81edcfb40f323b30/kinemopik.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819cc9d5eeb---nedigope.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qbljfnkkgefphep3qhntbtham1/84694365509.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160855234f21b6---19876615353.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ecf657807---41665037880.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0l5v23cdjigkt33m0t1ht1nemr/pimazikuvutiduk.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9437200285---29317520257.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/rimerirugozad.pdf
    • http://activesolutionelectric.com/images/file/xemize.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_off0000f13d.bin
55e8167781b5eb8494878efa12d2a4b1c14471ee40b52a1a4155182a6b4e3040		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 18064 bytes
font_01_sfnt_off000120c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 16792 bytes
font_02_sfnt_off000138d7.bin
890af518bffd60a90e3586d7b5a715e054aabf59097cfa5ff81dbdc3fabc6061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138D7 10872 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.