Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52041d16b7faa6a…

MALICIOUS

PDF

92.8 KB Created: 2021-07-07 23:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dd34cd0827eb76787f1c7c41ed3ee13 SHA-1: e18d51b2bd775afd77a16d9f877cc8e6b84ba91d SHA-256: c52041d16b7faa6a1ae304e74a21ce5a0e12e9ba2608c82131b0ede252d8b32f
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd340ec4a88---91493810662.pdf
    • http://sun-tes.ru/files/file/gugifefemodivevijin.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ac6967efceffc0cc2bd6272a57fdcd73/40978952474.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/7d9da22467e6ab9dea4d38291f0a4687/96673680567.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798067dfe86---vejabuge.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2357ed39e80f31c93099bd3bbd58b72b/53052719440.pdf
    • http://bjsprt.com/uploadfile/file///2021051819514149.pdf
    • http://motocams.cz/ckfinder/userfiles/files/wejupepesajurufug.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/jixubarozojax.pdf
    • https://mimpishio1bet.net/contents//files/36231241885.pdf
    • http://sosnovgeo.ru/userfiles/file/7288809070.pdf
    • http://agama-rc.com/upload/files/77633969101.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092dddc798e1---1821336623.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/474eabcf4661aa1ae379036ee4cd421a/75674401212.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913e53a918e---susavuru.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd78ce43d---wuwuw.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160964fa32f25f---70491327315.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/suzujuvumolapu.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/een2c969jmrk2npvb5iej51ld3/dojuwofivuj.pdf
    • https://hissekurban.com/resimler/files/gexamezanixojef.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608567fd04aee---15104381932.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/1fdbpdlrv4canoc4kuijvhk3f2/29309864470.pdf
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/kenozi.pdf
    • https://bayihoki99.com/contents//files/30873005615.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/dvpfg3e2pqd214p6ov7k1175rq/kuresurugavaxeri.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/89dc875ffc1ed5d69cfb16721c2eb440/1628490121.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=examples+of+report+writing+on+an+event
    • 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_off000105d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 16792 bytes
font_01_sfnt_off00011de2.bin
f2b440be30cd242d633ba368a9741977b819df6eb02e5e7efbafe00404e1374b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 17192 bytes
font_02_sfnt_off00014aa7.bin
4f899d66e924e6f184f5e5200121c59fe700324f41b3a24911cb9accc534ea0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA7 10936 bytes