Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90a5568faab91e9…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 22:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3103fb19c67585e655f6fd3d65bd844f SHA-1: 482f61e5574dafcaf6d852d9e9c2c74dbdf4b1fd SHA-256: a90a5568faab91e984812f89c1e53675623586be2f0893633176d0cfab08cd6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=millionaire+city+for+android PDF link annotation
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/fonoxudagofidemotoxatuk.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/nakomoribojomelefunifig.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161454ecd54e66---17936854719.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/xutumemolipapip.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf3f144a84---jenexanadikezokavobu.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317eae6d540---dipuzu.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/wovul.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/bapugepofuvebifek.pdfIn PDF document text
    • https://tempegaring.com/contents/files/lugirotixozika.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/zorutofateveninezimutoner.pdfIn PDF document text
    • http://falconltd.pl/cache/file/12845600641.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/benedezil.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147311f891bd---muvemawage.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/sijinig.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/90675585806.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/vedadugabexedo.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/wisorotubokawusulonemosok.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/safunebobulinu.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210903_DAF5ECDEFC17E54F.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/59527739850.pdfIn PDF document text
    • http://denge.aero/upload/files/17506207639.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/17554314980.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/xowagadopelokimupiwat.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_off0000bb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3F 16484 bytes
SHA-256: 12895b42b468f721dd65cd07b80af3a8c7369d3a1ed1d41ca9508c26344c79fe
font_01_sfnt_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 10408 bytes
SHA-256: 1ca60cf716ed651c10e5a1fb40f051c4bad73ce9611f30ae04e75e68004cbf6a
font_02_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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