Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0904953e1bb476…

MALICIOUS

PDF

87.4 KB Created: 2021-07-24 13:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87182781ca23f02fc4a40ea609c478a3 SHA-1: cdccf3dbe2cbbcae866d66ec35e10bf269bb0d13 SHA-256: 8e0904953e1bb47688d0aca8404c0fc900cd5b627a940e25c85c25a97dfd92af
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, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/8ed85726fbc03c91fb15f4df5a76253c/73161480321.pdf
    • http://brilsports.ro/userfiles/file///80682046682.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3vjpdi79cnbtee59qbn2e311s7/zobidimibop.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fbc562ddc---tebinulubakoda.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65947d1ec8---83093041214.pdf
    • https://avenue102.com/uploads/file/fadekuxodig.pdf
    • http://woorymart.com/userData/board/file/7317642717.pdf
    • http://banghetretunhien.com/media/ftp/file/52761896920.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ce9c4cefd---jozeliwojifavepuzuxor.pdf
    • http://pension-erlkoenig.de/img/editor/file/42938339771.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb6f99ca3f---depajoz.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607394cf216e4---jodojezidomisu.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e67e2a79ad1---bewagejenosenepaxinum.pdf
    • https://hojoairport.com/images/file/ragip.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160773f0d38661---jaburo.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a45695f5e---sepoxajugalokezuwuviga.pdf
    • http://ubest.ru/images/file/84838670279.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7993a95d2c---nazuduzaxixoxe.pdf
    • http://beiks.info/public/file/dudam.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e66cc36f2c7---difiledikexopi.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a459c4c814f---sonefagabilak.pdf
    • http://albino-pitti.com/pub_img/file/xetufezitaxilosab.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b063b29dc02---koxuxevowi.pdf
    • https://summit-christian-academy.net/scauserfiles/files/gobogifomejatuvezu.pdf
    • https://bistakalikotenetwork.com/userfiles/file/22189326246.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=formulas+de+derivadas+exponenciales+ejemplos
    • 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_off0000ece1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 16792 bytes
font_01_sfnt_off000104f8.bin
9fec07299f6f7323b6a1d38dceae05fb570853bd22008f724369d11e7ab468f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 10952 bytes
font_02_sfnt_off00011e45.bin
a7e1aca8ebdf9fb1270519fb9ff309a0705e0f310833b125abca1080bfc73f8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 18584 bytes