Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d83661bad77ace…

MALICIOUS

PDF

90.6 KB Created: 2021-07-29 14:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 401a823c24d47eb105a9bb003a774511 SHA-1: ddcd1a6111a3487e9ffb27b57efad23d0d6b2b7a SHA-256: 06d83661bad77ace624b2fdf257897f874e7da8cad7fb2c3fbf6e688142e2630
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This behavior is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cb7063fe883b530701c9055bd0fbbfa5/tanimuno.pdf
    • https://path.mn/userfiles/files/dogabovigi.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08e7f407e1---90568457396.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/18f67ecef72cda03a75467452a09fc02/12278225865.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/raxepudedebunow.pdf
    • http://aldo-ins.com/userfiles/file/79307979821.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0b113d58089244a29508d36642dc5c08/pasojuxakuga.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084b93c559bc---rakupegarowufodef.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2a238dfd8---vupexakakidonavegu.pdf
    • https://hashtag.school/userfiles/file/27385374565.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa6050dc6---vegenipisukaz.pdf
    • https://windsbs.biz/files/file/38307480217.pdf
    • https://codecs.roimages/file/xexunulavagaxawujufa.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c77aad47---76845084160.pdf
    • http://zavalinka.by/var/upload/file/fekokofunolejita.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086636ee96be---jodaledit.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/71795770503.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/th284c1ujh2ecq2sjn8bkd2093/patijem.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a00330b675---futumerugudugebofidekiv.pdf
    • http://dzwigipoznan.pl/userfiles/file/zeluwa.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b91642a42---9262410590.pdf
    • http://crmloccitanecr.com/campannas/file/tiwuwitakigegori.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=el+caballero+dela+armadura+oxidada+capitulo+1+resumen+corto
    • 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_off0000fb2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 16792 bytes
font_01_sfnt_off0001133e.bin
1eadb8f334dfea335fd3e2705a0a4f3f28766d625d273e21ca0fdc26dac174a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1133E 17600 bytes
font_02_sfnt_off00013ffc.bin
8b99ad237ba0c3934f2474d53e623d61afcc308054c2c25c7712f8b2639a632b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFC 11052 bytes