Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd63d2b6b33a5662…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 13:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 588d4e7faf0318894decf758f4e1c710 SHA-1: ac91e30c485bec8a2c51aefc21a2db5c0b3d397b SHA-256: fd63d2b6b33a566292f4f40ddd07383b53d84f41a3c53adfa3033276f6cab2ed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7385

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b2767db9cedac74095a3dff2ea1c023f/61686660473.pdf
    • https://almuhja.com/ckfinder/userfiles/files/77694702857.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ruvh7qte78mj4ou7c5r0673f6m/pinuto.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/82978537256.pdf
    • http://instant-image.net/UserFiles/Site/File/romaj.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5264e0c85a---66068140523.pdf
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/117ee99dd75b4cd44101ae09e99dce24/2350901159.pdf
    • http://theponghop.com/upload/files/32746696244.pdf
    • https://yuss.it/file/80114758310.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ae5d3a273498af3edd9b0fbf199f6527/batuxubo.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b354bd3d01a04fdc58414d8594cd4847/43709231359.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc5b320d1c---51880269955.pdf
    • https://narellesastro.com/userfiles/files/24080703372.pdf
    • http://st-johnson.com/Uploadfiles/files/ponuru.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/683610a309b3e4a777ec2dcb8928c1b6/xazovixirazerupiresono.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a7d2f090---39995852948.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a784243e114---18212193639.pdf
    • https://ispartaprefabrik.com/ckfinder/upload/files/dadafaxugegugobixuwixa.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075cab93e7c1---wuderipal.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2a329713---fanamokojefodolisi.pdf
    • http://simkoongschool.com/uploads/editer/files/jakowuduralegusibevutofu.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/rufejajage.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+film+sense+sergei+eisenstein+pdf+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb47.bin
7ebecbf53c768cc981e422912e0f3faed400807a3ad024d2a375105c1f5a8e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB47 10992 bytes
font_01_sfnt_off0000e477.bin
1b663a053adfb1823188148cf7f65ff80bb5ee332c7ff918b8055664d8a93fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 21980 bytes
font_02_sfnt_off00011cad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 16792 bytes

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