Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b7ce2b9eac4460…

MALICIOUS

PDF

90.2 KB Created: 2021-08-11 07:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c96ce4916dcfd555f43476a0d0882ad7 SHA-1: 9dcb6fa80e5d9e4c97351618f2e748ed6e68e572 SHA-256: e7b7ce2b9eac44608ff66e186e9fdb29f7e33901072fa9e9f6e7ee25f1c45c71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farms points to a tactic of redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a42ed2a0392---kedidizapinuwavaba.pdf
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/murulawaledupadufeve.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d314e61a82f---70370060012.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/pbeni76lgta7fcb35mi41l5nuu/biremajabifan.pdf
    • http://ampletrekking.com/userfiles/file/jubamosepevovenazolemip.pdf
    • http://www.agot.pl/upload/file/69063589960.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/26d4092ed12da06a454762205d7ade2b/zigumuv.pdf
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/63306269895.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/efa5s30bh2atgt5bu3fr1r8t22/vaxenotupikub.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/df197e516e050cd0c15f370bf0b61ceb/18816795769.pdf
    • http://agrion.org/upload/fichier/betudipudugizigu.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/67503942863.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4d5339e2958448e4daa837a34d6325db/japefaxexa.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/n3fmpmq9suprqmkcql9gc4mh0i/42848894599.pdf
    • http://fogathajtohirek.hu/fckfiles/file/tigemawuzolojiluxaju.pdf
    • https://topclassgreenery.nl/images/file/kakaxufubufaziwawisupira.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/xatibipudusaboroxiniwav.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed27ed0c8---wazepujaxigemapanatasesut.pdf
    • http://www.yoko-ono.be/images/userfiles/file/8508513336.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d288a17146bcef366f183917a2a0bc59/zokuvofopumodewewowegota.pdf
    • http://masan315.net/board/imagefile/file/17102074037.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160792a3b2ef28---68163434826.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/pk50p7op0k4ak24p2v4jlk1605/damufafifidal.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/somemogalufeku.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=discerning+the+voice+of+god+bible+study+book+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_off0000fac6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 16792 bytes
font_01_sfnt_off000112dd.bin
baa6b79263ca3846640524fa3549ee598a3c2700d07e6b635d418867165f7b2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 11252 bytes
font_02_sfnt_off00012ccb.bin
e3eba7b2039dcbde11a8c83f93fac4f1922545023e8c1691b7bc4c32d985033e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 17568 bytes