Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba51be86ebf31a8c…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 05:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d4f82e363c10e022c09b3f6523341b5 SHA-1: 0ac2331ca021a921a1aacb73c9d40453d562f316 SHA-256: ba51be86ebf31a8c0d6f6c07a9cb20e4585375a4c09a21471edf41d5e669aa3a
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload storage or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=calcination+of+gypsum+pdf PDF link annotation
    • http://espicycooking.com/files/file///tutudemufofugaxowox.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/31571014856.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25509157286.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/jisoguvonoveneroginamaped.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a48cb262d0---vimurivirubevijejij.pdfIn PDF document text
    • http://exima.kr/userData/board/file/pesanurejedixis.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/12012421745.pdfIn PDF document text
    • http://finchamauto.com/pics/nunudazuguraniwarateteg.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/58838268796.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/xofawusiwulepof.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/jatowojexefexowor.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110a12a6de2b---dunegadojolubepamer.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/zafijesejegesavugokawew.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/bedilit.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/98162668456.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///zakabezokolunitus.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/74b9c3e95c51b5c6585fb01217fafe34/diratuxerizizevuwikob.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd468963c8---28129239741.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c94e5069ea8---87807503936.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-2/20210802050957926986.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/59813551775.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828e1c42b87---86613996923.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/29829462017.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/a6ejcj3fps20nqrapmsp21045k/rizenisimulurilibapi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 10976 bytes
SHA-256: e6e22fb01c30dc1f4115e01b51deb87665befa3f20ae7c9734e8c997766f2a3d
font_01_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 17988 bytes
SHA-256: 8392712c8444ae71be1c5877ce6dfd569a99ef74b0e3cdeb5d05426f90cdd32f
font_02_sfnt_off00013876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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