Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28dbf3c6e05a882…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 22:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 67eb7e9bb2b75f3d795f0a3f16a1082e SHA-1: 12bafdf27ec36a5c1294cc9cd48db4269847b999 SHA-256: f28dbf3c6e05a882e53d67e58b90f6afdcff07f26ddbf80c61774e6cf78d6807
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads. Embedded JavaScript streams are also present, suggesting potential for further malicious actions. The combination of these factors indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3255

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.
  • 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
  • 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://habibitoursegypt.com/ckfinder/userfiles/files/pufigexuludofubit.pdf In PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f947a8844e67a93dac2f49f9f16609e5/dowipebib.pdfIn PDF document text
    • http://fitviewer.de/files/file/31842989399.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135927e09c88---wabajesu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130efb5c1fd0---vapesenuzaroviwixareko.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/petorelekufepefogod.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/1097110756.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/lewunodajemowogimazexe.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/kibivunamim.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/78920374727.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/aa0bdeac5a1ba989aca9eeabc4a3b0ab/zelivakagewofu.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/7537352766.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/muvunexoj.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/77363564521.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/xubira.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/df2bc5728e6fa68c70b63b8e3e418c72/saxub.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/53161249232.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/18548071474.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/28570900795.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/wopunoketusasijemetoni.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/95565321121.pdfIn PDF document text
    • https://people11people.gr/uploads/File/sijorojopud.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/bijav.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/74683095471.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/50025ddb3504a99097ccd16acf7d9a03/70337193753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+pocket+edition+modePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EF 10652 bytes
SHA-256: f30271bbba266fba7bb761a95eda88199ca84dafee6ea9485676b4aa7974e1cf
font_01_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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