Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c3c9bf284d7df1…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 17:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 31cfe01205d8fe6b6d7c38b192f52ed5 SHA-1: 87d34c40b99b846dc7d052692b2546806799d023 SHA-256: b2c3c9bf284d7df12348401a14c9b5fef5952be06e13d7a862ce0d9344934a43
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a link farm pointing to various domains, some of which appear to be compromised or disposable hosting. The primary goal seems to be directing users to download ROMs, as indicated by the 'utm_term' parameter in one of the URLs. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7319

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://medicaldistri.com/ckfinder_files/files/74102789258.pdf In PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/68072123030.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/vetosugekosugovu.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/63980898262.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/83877274823.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/zanojiwolepatajeb.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/vowivajawosujusitatide.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/63215634110.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/besunajiderulekebotisodax.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/nipifozikepakipidem.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/jiver.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/36758191652.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/zepalamitudunokavugav.pdfIn PDF document text
    • https://invision.buzyhub.com/files/vivexojapevakeperawe.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/josuvisep.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/87104583330.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/1443172721.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/47803027950.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/21c1aa47c03a5796a1329aca76c223f8/robebazo.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/zuxozisinopumar.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/roxawemejikabexusesa.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/21456544647.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/hu7vubasvi6oaqhtrb8bltdbrp/ridigesijuzobokewenazepu.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/bexajagur.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7049f75a12be87df78b28da0021a16a9/dofulogomibomiwapufed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+mega+adventure+gba+rom+download+for+androidPDF link annotation
    • 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_off0000b611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB611 17288 bytes
SHA-256: bc4b8a793544c07e59c9a96fcd8394cfc650242dd578e5d422dfeac4e1d3c356
font_01_sfnt_off0000e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 11016 bytes
SHA-256: 1ea241d188cdf196e9295fb25d161a91b3dbef8bab528c960d6bb43cc22f9d84