Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ae9b92d9757b2c…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 02:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3bcedc1beb401444e81ecb33feba025 SHA-1: aaffc4703feb80b87dca8537f001438f6476885e SHA-256: 21ae9b92d9757b2c1dc6778d106f5d10c224b0c53bbcd85fe60c4a22a2e8d2c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=ias+geography+notes+pdf+download PDF link annotation
    • http://airconbank.com/upload/fckeditor/file/60078769379.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/44873390910.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/74502194363.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/nedovagosilasenefeloju.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/t2ss154rjr3mlmq63kokk8ev8b/79631797440.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/salisibotazipifiro.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/41470633275.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/jirebifaxumisakejisikujox.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/19jd70vficlk1bn9j5g42ven97/mobobuwuvutabu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af46f7c1fee9c2cfecbc3ddf6565d283/84084886531.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726316438f9---45477217304.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/44b1884df31a66b4acac29b3251a0a39/vaxixogipofumeruvuf.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1b221f19251924f34ffe02ff7e4063dd/fabezutim.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/seveb.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4398125e9---84846067190.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc24c29af6b---7001093924.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/f6b215b64ef6ce20d1f9ac8a2827b8b7/60521173533.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f408924aec---9594619373.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb62ab51bb---70603387221.pdfIn PDF document text
    • https://alariel.be/userfiles/file/44973519706.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/95888941220.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/kejufila.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_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 10836 bytes
SHA-256: 5a881eb1fd7aaf6663f9699d5e0420605a9bc2c3f22872b144916bd72b5c5288
font_01_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 20040 bytes
SHA-256: 8be88cb5dba7c3c643cc81b74c9b37044fded77d26b5c8416ae570f73e0ccc42
font_02_sfnt_off00013816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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