Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bf0d646b210762…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 11:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8fb175911ed88b6fba00e2d76ae2bdc6 SHA-1: 134e5cce0397298837eb381e8bf785a99210937c SHA-256: c6bf0d646b210762c123a90dc4e4748e5635d4bd9a3184f0b558cf479d730ef2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to external sites for further exploitation or phishing. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f2958cc81bb---95071328491.pdf In PDF document text
    • http://iehyun.com/editorupload/file/16084845410.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/5287a13e226bf9992d60525fdd6daa1e/11300988698.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ec0f56eb20646a2682b3595f7876a631/vanerikobosimutaw.pdfIn PDF document text
    • http://myredm.ru/uploads/file/fibijefulosamenasuwimiw.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3uus107ss1mss0jisag0duss61/divakoxoxeponex.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/xunevokevavosiza.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/41873083310.pdfIn PDF document text
    • http://markone-tools.com/upload/files/71882986669.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/81368663678.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/lexodenezebemevelu.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/tanefasokilenalamijemon.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/foduwabubeziletozab.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/3334493381.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/21376182777.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/jetunobelizepo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jfufnbodsfb3ubtrfq9mdnkjdr/20066308828.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/dezuwavurowinovogatosedoz.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/liwoxadejij.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161095e9dd1aee---duxejonuwedutikus.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/7e9b6da2ae5c5c6f1d513f961feadbc7/jejejov.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8nukbu5ai4a31pslbrfhmq99hl/sedogifudaxekiturajafi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5bead517e---31690647555.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/54119688064.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16083addfeaa7d---31439150167.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/65739911021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=desalination+of+seawater+and+brackish+water+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 18560 bytes
SHA-256: 11d3be49067383b223052fabe7094be11b8f7bbcfc23e41cd98ab40ab4b6cc8e
font_01_sfnt_off000116f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0F 11036 bytes
SHA-256: cd55a42a7bde6650db7c9dc0e0b597574541ef5a552f285cb75d7a020b3bcc70

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