Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea817641c0eb309b…

MALICIOUS

PDF

73.0 KB Created: 2021-07-03 10:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 717f9d74d66545c01a7563106dfb3400 SHA-1: c8b5e97d8e8e2568c48df713cfcb843ccfeab8a4 SHA-256: ea817641c0eb309b98ac86df698f63fcaa41bf55ac009ac8beb3b15caaa8b843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for further malicious content. The presence of external URI heuristics and link farm indicators strongly suggests an attempt to lure users to malicious sites.

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://infrive.ru/uplcv?utm_term=communication+networks+pdf+free+download PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd1fa386b7---11349864605.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8116092f3---46374449209.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c11d52bcb---88199407989.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/562eea6108d9ea60c854e7ef10c4493a/40980128543.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb22fbfaf2---56008855404.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/rasoroxuxipidovumoradej.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098af467f679---danibomu.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/jufigikexofafolima.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/04af1bfc57335bcce323ccc3f25adf1d/kobowilosepaxifejax.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/771f3e909689c5debaee5d338828f073/2569790469.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/99271383753.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/99110653606.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/fotanojuberegomulemox.pdfIn PDF document text
    • https://nattasampun.com/upload/files/50077808622.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/31323908079.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/nelaxefuvebigoralipanov.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160749190983b9---rozibagigimalofow.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/96805c5787873abd3914ca922271666f/wojowonefifamok.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a388add56a---mininiv.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c7083e0acb17bb9dfa5f2be4b8e00067/semesis.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/14719941805.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/9a511d04b2e7af2c40140a4370913a7c/bekexotomixab.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/39343774337.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_off0000bb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1F 16056 bytes
SHA-256: dcd5fd47e2b34ce4b00ae37511558fdde27f753b9c759eeb7d2864c91928446f
font_01_sfnt_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 11092 bytes
SHA-256: b56d0a73114e17e81af779a5f8c507108b9b6d106ef956da3683edba22e37e2e
font_02_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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