Malicious PDF — malware analysis report

Static analysis result for SHA-256 931ed62a22bf0cae…

MALICIOUS

PDF

98.5 KB Created: 2021-09-06 11:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f00c89b26b9a3da09a4e81e8dc18f31 SHA-1: bb863eb337991a7b756b63d6bb2ed92b35cda513 SHA-256: 931ed62a22bf0caedd860cb8f480115f868f23a302b811528b497abf58a9c3ff
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, forming a link farm. These links likely serve as redirects to further malicious content or phishing pages, indicating a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749df50843c---sejaloditebabeluwudiwoke.pdf In PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/91561148718.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fcab96e49c6---jufunewobuvuf.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a61946ce45d---takonofimulozonetur.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/pasovukimip.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3ec31011d---puwunifuwarelusurixupuveg.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/guwuxipozizujadamijeku.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16110432a506e9---42508575178.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/lifuregixovaganenixem.pdfIn PDF document text
    • https://maisonforville.be/documents/file/77674189918.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b7b172c1---25280503714.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085a913753e9---jufeguf.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85b726253---90166105161.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/35142937455.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/k5e2tgkbm7iv51augfcrk87cq3/22870352986.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41a85b7a4---29751519485.pdfIn PDF document text
    • http://matras-devison.com/upload/file/wabasuwifelibadutusexor.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/kesuwud.pdfIn PDF document text
    • https://ka-base.no/images_content/file/gozubadijajili.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328ed273bc9---tolabigem.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070fcbf90552---raluxepogikugujevizime.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/40f9b98da8487148b56f82e0e1595031/144427119.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/releridutesefadukofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=apprendre+l%27arabe+debutant+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11591 22100 bytes
SHA-256: 37798e7664e155242aac9c797668ab3efa0e5e268d98f5d2b32e4cfd26ed3bb9
font_01_sfnt_off00014d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4D 10364 bytes
SHA-256: 36356f3515767ec1058b9dd063dabb48d753db50ab4dbffa0b28cc782e6af71e
font_02_sfnt_off000164a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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