Malicious PDF — malware analysis report

Static analysis result for SHA-256 644569498c813638…

MALICIOUS

PDF

85.1 KB Created: 2021-09-26 05:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a757fd428d4fd87b61a61e008cb356fc SHA-1: 0f882da5746df3d6ff203f952397fc06d32d77e1 SHA-256: 644569498c813638efc91a1dc93a573de8676407ddd35b428beabccd9f56e6fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised WordPress sites. These links form a link farm, likely intended to redirect users to download malicious content, as suggested by the 'utm_term' parameter in one of the URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=download+the+legend+of+zelda+breath+of+the+wild+android PDF link annotation
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1398c318---gotekamegizubivom.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/98449588692.pdfIn PDF document text
    • http://primaneighbors.com/userimages/30015603302.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/2401087428.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/34856408588.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/vawiwuta.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/59230304116.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021925921484791.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/paburele.pdfIn PDF document text
    • http://yuha.be/_files/file/liwipugexazemapowupasezev.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161470959d0fa3---78637013001.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/xarikunodokezabo.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/vafixoxotunevelopakawiw.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/81695741173.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/kakifewolevadizakeza.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/2175857187.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/kuladezede.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/vesuxoravoratewudewifugo.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/31460766274.pdfIn PDF document text
    • http://livilgirls.com/files/38187378553.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138f694e62e7---13775058900.pdfIn PDF document text
    • http://e-sportis.com/images/upload/zivelafuwezule.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210917105907131.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/tejafaketakujijalibafuf.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109132252274811.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 23804 bytes
SHA-256: 6649ecdad08dbb9dde1bc73a2dac05623fc956015f084419a190c973ce50bce0
font_01_sfnt_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 16288 bytes
SHA-256: f9ea35faab071a6969feda981e147e8ecd0d41da9ad9f745a3349ae55393c0d3
font_02_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 10752 bytes
SHA-256: 6ab19aa003dadda4d227c7f20e927245fb314a27c4464b1f95c8b14836f2815f
font_03_sfnt_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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