Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f780b792d50edb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 22:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a0205770f70541d8505be3a2adf9498e SHA-1: ac746c853d778e4ecffd29116e7a5e8faa8d8df9 SHA-256: 82f780b792d50edb08351a0b47a2f6d86875b944abb50fb31be83e5bc8c2d0bc
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 0.9974

Heuristics 6

  • 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.
  • 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://iveducentar.com/uploads/assets/file/52058392948.pdf In PDF document text
    • https://kristaldicarlo.com/userfiles/file/8187379181.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109052125034148.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/dasijomusegudowi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e15f3eb06---soditamawokokowuwo.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/22803783895.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/pafagolebememaxapedune.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///vunitukez.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/85458124708.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/g99g35daeaujivkdghcdi0r9p5/zomodirik.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/45513017872.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/29919568569.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f111c094c0---9399743729.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/58751244719.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137cbe602857---wilewomizamem.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/latikinadarova.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/90813172179.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/25460712297.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/41838906343.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/78827643511.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lulumazaxilazarixabug.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/17916661595.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/vixovojipazezajegigumo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9a42f6e4---80358258739.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/47814512124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=euro+truck+simulator+2+bus+download+for+androidPDF 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_off0000d1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C2 11028 bytes
SHA-256: 99ff5312876a0887b9034fded30b595ce93bf31efb0bc151d2e1f8d5bd2f96d3
font_01_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 21388 bytes
SHA-256: a6cd84c5eb738d282f01f7fc5b7a0afeaf4f20228d4f6da66aeace7f5c682b08
font_02_sfnt_off000123e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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