Malicious PDF — malware analysis report

Static analysis result for SHA-256 a499973e5e923ad1…

MALICIOUS

PDF

88.2 KB Created: 2021-06-27 00:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7440e63b5251a815d0efa797858a132f SHA-1: 0b9a2cccdfceb77feb570478fe803a86eda473c1 SHA-256: a499973e5e923ad1d134760c6f648f61e9eb7db373998fdb127f390ddeebe237
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to multiple external websites hosted on compromised CMS platforms and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest a tactic of using compromised WordPress uploads and link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://ddaengshop.com/ckupload/files/terogojaxovigekupag.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/xinesotuzulamovegemitap.pdf
    • http://theultimatemarketingsystem.com/survey/userfiles/files/66797316482.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3da9193346d5efa00496225137784e7b/piredakikomilenazixu.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/5q0pmnsr0gottgj6r9lt9p2em9/376959152.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8565e212e---85640688831.pdf
    • http://biotledlight.com/userfiles/file///jijevipubewaxorabobogox.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/44435034472.pdf
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/kukigavusodidobosurad.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/agl4oaak2fav4hhtkbr98la645/82383469425.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c9e4771770398ac2eb5aeb208355c8d1/8637065144.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092d76e33c35---vagafidid.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/2pj4sr9teaevv5nm91dno95oil/95093079043.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/025ea4dae040f738a66722e184cb7bc5/nutomewedozupizi.pdf
    • https://xistenze.com/files/files/sirikilejek.pdf
    • http://rbtyutj01.com/userfiles/files/lobiwegotidobonivosarigub.pdf
    • http://frezerovka.by/images/fxeditor/file/pilaxe.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/940b59f7982032e0684aecbcc3cd7352/85860870913.pdf
    • http://vom-ragnaroek.de/uploads/file/renezasov.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cc661b5413c---xamujutakoka.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902e9572ae8---funodifinomiwigemarupub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+mobile+uncle
    • 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_off0000f784.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 16792 bytes
font_01_sfnt_off00010f96.bin
be2eb18313207d27c04265e770fecfd860b7e83982b8561bc35433313172ea9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 17112 bytes
font_02_sfnt_off00013be4.bin
62de899a5a913344ea92cfc28e197f93f140e04914469c49f01a866dae0b9f71
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE4 10492 bytes