Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b828fc86a438594…

MALICIOUS

PDF

93.1 KB Created: 2021-09-08 00:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15cdfab3a2a176667af6a28a1fc643ea SHA-1: f6ad21bce810250a2fb06a0e10f22f4aacaaec3d SHA-256: 2b828fc86a438594969156f2657520f98140a015b594b174265da4014ad289e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=exodus+20+commentary+pdf PDF link annotation
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3286f8575b---kabiruwo.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c2a4c3d1e---lijav.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/melojomovefavexado.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/walak.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/15483868274.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/51539925279.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/m7im44finhdt655adqae570prl/zotamotibosazu.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/66146695283.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3a5854339f10d0e10b57363f3241ff2c/87333106585.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/42941151531.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/96785570347.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cb0051474b8360a415f916da43ea26b9/wikegaliduwaxupilabekego.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/io80d920vjfqi5km8gcnh7ps35/sonumaxokebobufi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098442d86d07---56919972781.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/rukotigituwus.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081f0355807c---88505775714.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/45845546165.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3b121176---jideporiranoko.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/tiziwabupunum.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cede5b67466---jepewepozuvexo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ca12c508---visikavukodudodezar.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/18096579625.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 11184 bytes
SHA-256: ffbb0dcc6dcdb7dbdbc0197a528df70847288b1beefbf2601aad1e82da3ccfb8
font_02_sfnt_off000135f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F6 19096 bytes
SHA-256: ca93775a3e63ccf96944a513c726491b9dd3a3f5100c0135dbc5397ce7fd088d

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