Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9466c069110167…

MALICIOUS

PDF

88.1 KB Created: 2021-09-18 08:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4fd715c340d9331b689ca4509a236382 SHA-1: 1eb2f13c6f7c93605c0f3f61d1a4fdfe241d4b0b SHA-256: 4e9466c0691101678246155fb589b5975ec8943dc8c9a9308536f91061518368
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm to obscure their true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=change+default+open+with+android PDF link annotation
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1360720fd---duxaroraralusujanesifigu.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/18333753175.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/66184903572.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/lepukelizagaga.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/balis.pdfIn PDF document text
    • https://matratva.in/userfiles/file/90023890169.pdfIn PDF document text
    • http://potlista.com/file/files/porevesurivaziromogitakiz.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/67311265240.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109120323395071.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/89713612855.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/53f5674ceb0e97b9f0e9ca6a43648c5f/60250227549.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/14294941004.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/47068443764.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/33639465026.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/72199923795.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/laxulamalixetaxafawex.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ec80a79a8675fc6fd2bc133e4c4044cb/winirasivopu.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/tofetapabamunamowapuke.pdfIn PDF document text
    • http://netflor.pl/upload/File/roxawubove.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/tilogejunodisedisidad.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/somatus.pdfIn PDF document text
    • https://istanajp.com/contents/files/wotijijuzakibowuga.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/91793406038.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/roveme.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_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 18936 bytes
SHA-256: e6c3710b524e9b6a936fd3fde41800421a71ca71787c7a0e99cb0a6844eaffd5
font_01_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A13 10828 bytes
SHA-256: 9e260c7590a74a98d21f99914f24c5291c99fbf0c21eb12249f0189279017455

Open this report in the interactive analyzer, or submit your own file for analysis.