Malicious PDF — malware analysis report

Static analysis result for SHA-256 6373d20c487ce8f9…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 13:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 45bfdf118f7c687a9906b6f81045866e SHA-1: d12d8b1e38fa8aea05c7e14abf390b752c9cb550 SHA-256: 6373d20c487ce8f9aac7c136a6d99de58a57c720fffce12f2843d855b6cf4ee3
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and heuristic firings indicate this PDF is likely used for phishing or distributing malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier clean score 0.2255

Heuristics 5

  • 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
  • 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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ofb6voc16rmt8adcmj7p9lhsi2/59073251763.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be3080e09f3---wopizij.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/pojus.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/99833102749.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4ff90296---jasakepinolo.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210607183053.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/60212921440.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/94470773836.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bcd90025a---vunewowedegi.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/zofifalapejubipava.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077435bf1e95---89648696669.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/watamumigasidunise.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9vnvk5kf72a18nd0451elkvj0m/zexirometukokiga.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/43048200851.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/gatidirilunizilelival.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wejirugi.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d93e8959a---zojam.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/88165245946.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/42f63510cce33dbbf4b7b7dee3a72264/89134907583.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/kk8c23t3flesutum61om9ng2fs/63689212348.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/teruvegunogoka.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac086056388---70520981819.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/janiwoduvizikanusamopiv.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1611340d11a4d6---78028889048.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/58858809047.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/4925458609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=french+english+learning+pdfPDF 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_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 10660 bytes
SHA-256: 56dac7943a8791608e646b4c978bc7fbed77d954790d6636d62410fce4de89c1
font_01_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1