Malicious PDF — malware analysis report

Static analysis result for SHA-256 041fa4f33f975c55…

MALICIOUS

PDF

94.8 KB Created: 2021-09-04 04:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c564030409394127f0a22a3da7504cbc SHA-1: bc5810cbe965739c75d23f527417d2e5df57c0f6 SHA-256: 041fa4f33f975c5592e448e8946ae3c84ee275cce2020627d1c153da3d5f3eb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations. The heuristic firings indicate this is a link farm designed to direct users to potentially malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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 http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7f523b33a---koxadekitifosovunaritu.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/42ac195bbcc18afd731b07f1530294ae/sapiraxolanidodipem.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/77398258070.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/18100112507.pdfIn PDF document text
    • http://huntland.hu/upload/file/90502548836.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e22b039de9---46215463644.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/4199901845.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/5272288162.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/zinutogewabe.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/361ig5c6aj1g863r1n7o1ifjv2/64069566783.pdfIn PDF document text
    • https://emmaushuis.org/pages/lafeduxefev.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/50007466193.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/43825139455.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f7141d27---31500875322.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/litunoxaribuburadepun.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/zizuzebudanajududajunux.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/rivugarudanusurawo.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/tadipukekom.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/19758808173.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8cd9eec96---61379632375.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089c29fc0297---66201894054.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/foboxozobijajenosabinet.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/3484869f0218fd095b8d89c1f311ac53/wapatukumoxexuder.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b1e2d73151ec36468c4555023053bed3/ramevalofekevof.pdfIn PDF document text
    • http://zatacorp.com/upload/files/gelajanokojidagexasi.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/bezunuxinukojek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=city+of+tshwane+town+planning+scheme+revised+2014+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 19072 bytes
SHA-256: 73733f50e88becafc5407830064d48dbfe422569dfcb74861442fa68f48ab7ba
font_02_sfnt_off0001399a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399A 11736 bytes
SHA-256: 3d175a7e9bd8912d24cf6a3862c44d94408d89260feceee6027a1b7eb3343599
font_03_sfnt_off0001556c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1556C 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068

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