Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18247329e28cc96…

MALICIOUS

PDF

89.5 KB Created: 2021-07-22 03:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a890c2f4356cca01eca9b1f97cba5006 SHA-1: 10c4944cc24d7cc569f5ac4024d0049f450d1285 SHA-256: c18247329e28cc969a1d1834c2e1c99b9f9b255f18d0728621d916684d8b7420
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised CMS upload storage locations and disposable hosting sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ub5790guemf2mvlrs8j2toacvj/97076753470.pdf In PDF document text
    • http://livingkaneohe.com/userimages/devisuruginosixifatu.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/65273762421.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/kizijoxon.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/fetipusudumobakuvojep.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/omol35e18t3o1olk1grckgaekb/bogexufat.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c29cf0b01---niked.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d48ec4a0275ded64654cb5a28ad57405/92799606266.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/7304401511.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/makotarusenu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f42c6440ef3ed7b6c1243c808509a02d/54998966498.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/xejunaxikuvemoxalo.pdfIn PDF document text
    • http://liberty67.com/clients/41815/File/48041512377.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/namilakewisoxowixeb.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/26849751360.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/996b38fa669b859bf26ae8d73c926eaa/jewun.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/ruxukizumemotas.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4da33b0571---gudifozerupozizuxijibexel.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/20ac076c08e8145c0c02a64d2c4e02a9/tagarixade.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/somizerigoxetufegoma.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/vososanetuvamuwipozuzuxed.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/popeginetarogeluwimu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/888e6e4dc9785834df590b623a4ba81d/7727616824.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e517ba2e055---pivajifixowuvipajelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=into+the+unknown+makingPDF link annotation
    • 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_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 10468 bytes
SHA-256: 90aaec21a15c824f2e063908dbf896c4462f03f047620f389e67bc6f0671ddfc
font_02_sfnt_off00012b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B67 17016 bytes
SHA-256: 9cea8c669c1901e9eb42ee78dfb9c4807f77c02311014e42fe0562b81545be94