Malicious PDF — malware analysis report

Static analysis result for SHA-256 2666f225606b82a8…

MALICIOUS

PDF

86.7 KB Created: 2021-07-14 01:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1216f3a369a303e758b814e5f160f69d SHA-1: aa3c4a104bc019df217be4ff2c4f99f38919a749 SHA-256: 2666f225606b82a8bb0c7ab12ebebe0f54c6d6bd5aaf8472b584409f3534de4a
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_SECURITY_BYPASS' indicates the document explicitly instructs the user to disable security software, a strong indicator of malicious intent. The ML classifier also flagged this PDF with high confidence, aligning with the ClamAV detection of a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://cructi.ru/uplcv?utm_term=nfs+mw+2005+free+download PDF link annotation
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e9e693a3---japuzi.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/29042934969.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c96313830c5---57266795411.pdfIn PDF document text
    • https://kultmotor.hu/images/files/31311138572.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7ad499ee21176ebf0d9b269a22e861f6/2380934742.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0110d563b---8999569872.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/95899760283.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2f513cfc182957c3e23d45df816ecb9e/lonibetuge.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/16584524094.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/cbb94814ae94716ae39d18b95ee2eb85/biwopeteture.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/25qehf0rqurk89pj7iqpem3k16/72676498638.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ba6ad79cd2909f7f512f07729c12db75/wuzufidodofowebofofaluraj.pdfIn PDF document text
    • https://landi-bg.com/images/file/kulixorosovirijokisevi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922cc313260---80030121703.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/59487418907.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba89b07d4---35369152344.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8t0jn0sv4ff4eltcn3007g8rdf/lenaguxaxidiminubekusiwiv.pdfIn PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/66282810049.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e631f70c603---83655885453.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/zivitonetanixig.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/22839206402.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/369pquuddvk14ppo4j6ga8nc67/60783187563.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/gaxevamuxosajani.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/1fphsf4i3cp7mqfpesb4e552af/doseli.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8ad018ea---woweremalejakop.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_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 10764 bytes
SHA-256: 5a12cb60e5f54f868a4283a39221a696d0fe52f48f2d866539b343aeda8f4e9f
font_02_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 17880 bytes
SHA-256: 575ae7a32e1052f4a1c26061627a0d7e30cd5c2a186a19cbc8131d9953a8fc6d

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