Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d74672ec4b2a67…

MALICIOUS

PDF

88.1 KB Created: 2021-09-18 01:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7cfeec02667efb1e5b6258786dc33e2f SHA-1: 01182a006bff63096cfd4a746d6989d1c6ba4386 SHA-256: 50d74672ec4b2a679f583d898e166e98f45b52f8bfea5b7355c223993724a983
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=drastic+pokemon+black PDF link annotation
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/wolukukimafud.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/diditesen.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/64748853157.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613f18c8977d6---84841922938.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134f05d9beb0---674701074.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/36433478664.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ovu06crj4ojed7jtefnd3dknq1/wujapubejamifajapu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161435e9f7f66f---50746370290.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/gomire.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/kaxeb.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/42663213726.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/8392188708.pdfIn PDF document text
    • http://bienbao.org/uploads/files/zidur.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/tipasegatemat.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/wivisipa.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/85597817385.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/27d5bf6f9da4950d58c78851ecfd9055/wodadirasozekunedamozo.pdfIn PDF document text
    • http://rs-entp.com/upload/file/55565203973.pdfIn PDF document text
    • https://elemonbg.com/Files/File/66779055202.pdfIn PDF document text
    • https://cet.sk/res/file/23390627615.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/29690274939.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/83100505149.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/91679332027.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/60427992188.pdfIn PDF document text
    • http://egitara.com/upfiles/files/57040226128.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_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 10768 bytes
SHA-256: 6b2ed1415b678638c7c6a46240a58168d3d88e1aba2852c126001de37f4e4418
font_01_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 18728 bytes
SHA-256: 2d18d90c7843f05a17f67c85f1e21dd876d96743f8bd820305a0c0925fc29f7e
font_02_sfnt_off00013ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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