Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0ad47cb35a3413…

MALICIOUS

PDF

70.5 KB Created: 2021-09-20 10:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6943e20fac64264f0e9bef3a8da6784d SHA-1: ed9d36f16c2c2a72c6c74b49331243d8b9ce3bb7 SHA-256: 8e0ad47cb35a34136a447dd132348a380a01a72c1423c01e84ce5710422483bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://ballarioarchitetti.eu/userfiles/files/wodez.pdf In PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/66950414522.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/lirogekimikugexibup.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/89982472039.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/61884571892.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210911_163304.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/dozepubudamojewaziporuzax.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/zuzuwulavoxoji.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/votinabuzodu.pdfIn PDF document text
    • http://temple.mo/userfiles/file/75691020510.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/ruwifugokod.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/bevexege.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a5ef6da7381ae57ae437cae22c9812df/59838655293.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/40829768843.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145b64185b1d---zudizovukekefojemujonenun.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/12386007283.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354dc1d24e---3826659833.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/30139223948.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/34381855950.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/58000783212.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/gaxuvalafenibomenowux.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/gerubokarij.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/53971924704.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/vulapijiwegobuwuwoxavux.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/92533208936.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210901_4A358EBBE0FDD7E3.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=onlyfans+free+hack+iosPDF 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_off0000b651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB651 14900 bytes
SHA-256: fc0e95ae9b31e518383277c43d1aa53ad5309c33bb35c2ae614a629073f7b4e2
font_01_sfnt_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 10568 bytes
SHA-256: 8bc5f7f9a34c01165c9a6ef8b4d6fd8f6662a098f75230db3b99ce4758e22b8f
font_02_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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