Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3171f2ab0662625…

MALICIOUS

PDF

76.2 KB Created: 2021-06-11 10:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fceb1d9256920981d739a3c86ffb531 SHA-1: f5cbe3221af98d13be9ec012de52c42dc03acb11 SHA-256: f3171f2ab066262568129e012e1b9b4dc61b51a13d839ebf610c3c8c385790d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9330

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://nomylo.ru/uplcv?utm_term=class+11th+trigonometry+formula+pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/144fa152e57659172105d9a43e7633a4/58996813967.pdf
    • http://softwarefactory.nl/images/file/dowiwozinibeb.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c894ae674d6b55af2926a07fb1a4187a/66682346718.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/f7oqjmaam3rbq226hen6uo3lkp/kexewariwi.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e26ea9ea31555e4093fd51637b6cb24e/67257195187.pdf
    • http://asfalon.com/__files/file/fimofimixarefatolububek.pdf
    • http://pogservice.ru/userfiles/file/27852272006.pdf
    • https://alshaabcoop.com/userfiles/file/vijixawofuxesavo.pdf
    • https://m-astar.com/UserFiles/files/75558244738.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/b0nagpasp04pp9eib9b3kvtf2f/24679930665.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b491a423813---kupaxu.pdf
    • http://zap-interactive.com/uploads/files/guwisojuxudozejubim.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160856d2b992c2---40473482090.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160708f4127ead---tibuxigoviminaluxabunu.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f18de279---bebivod.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f024dd9e---54852885584.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/6gkgjnrs5o1aabkj2a0cvvp2u1/7050762490.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/22853966300.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d620.bin
6cb58b842a46b75863932b592d53ad7f5bfeae0bae2f7de784e4f7544ea70bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 5512 bytes
font_01_sfnt_off0000e8be.bin
0a4a18cb7532c643edf4a37ec3c0badcc8e7b023d37853f24444cb85972f4259		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 10876 bytes
font_02_sfnt_off00010de9.bin
4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 16072 bytes
font_03_sfnt_off00012288.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12288 4324 bytes

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