Malicious PDF — malware analysis report

Static analysis result for SHA-256 35980fb43aabe44c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-01 14:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dff070ba12c1b3e1c2cad668f207fcce SHA-1: 34ac5833b2b09e5a62ec9eaf17399b0ed1b5f3a0 SHA-256: 35980fb43aabe44c2f53da3f77bfc8b3f40b8657426e5c830b366478d527b266
154 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6237

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://grandhotelbulgaria.com/userfiles/file/88973609918.pdf In PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ejcgm86eni36l720tubavg3bq/97605127254.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/dizeguputigetazapinejas.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/73a2ed8aa3807deb7d59150bf2b75671/39861421305.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/58a0a5b7b25d9e43c5a647f531e78ce9/76703272178.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccea76c5f6---tomoni.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16107c30fb2f25---xutulipop.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/50309009877.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/borotowusagekowima.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba9743f297---kagagobobowomofawuboloxuf.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc7b6bc97---rulazuwowarakijilawixitu.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/815975885.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/54071529999.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/54aa65911da3a2153a78ecf5880c6dfb/31420382125.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/54746869222.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/102303394698.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/29197264130.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/21331145903.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/temawurefapepevinal.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/gamidos.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/06f32bf3a7d2c65ac2c4638dc8eeabd4/33713052234.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/34737488511.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/zovixifanipufekusijovufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=my+engine+is+overheatingPDF 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_off0000d74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 10512 bytes
SHA-256: 5f61c6470b00ce12670d0c3db5c1d681f7dd7adf168871b906c0645fe021d075