Malicious PDF — malware analysis report

Static analysis result for SHA-256 652731867e5e432d…

MALICIOUS

PDF

70.3 KB Created: 2021-08-16 11:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef7fb92dbf4c66d0a0c7a14a99ede649 SHA-1: 5be720460332ed85b576a05598f89e62163c135d SHA-256: 652731867e5e432d7b3e51395678f4c7de3a10b79273770a52cc3ce0e4799710
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions, while the link farm aims to obscure the ultimate destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6923

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://sailstudy.in/ckfinder/userfiles/files/26200691533.pdf In PDF document text
    • https://gyandeepjkss.org/userfiles/file/22075528655.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/29578243448.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/93814656388.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/wixaponoxiga.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/37071055063.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b8vrv97i9rblogimq9rmprgaj2/99930165973.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/41268032344.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/bokore.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b926546cf4320d5a701794cfea4dd645/77912126429.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a8ec59459---dudolajifawamejisa.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/nejopeladinob.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c979d2c4aa0---dexaxibuwedekivasenexaj.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/33852542175.pdfIn PDF document text
    • https://afayl.com/userfiles/file/guvixafojejumudusedi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a434d0259---dakatizokaribixorokem.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be31d3b2f87---89439712476.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/5hs9o65a55snrcdokami8qh890/repenuf.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6580c7267c---74177708902.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/9ec89011b35a58c89ef0b6ba96388837/derosakij.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/3t2fqbi8ggpedqi51h0sm56ce2/18587827923.pdfIn PDF document text
    • https://polandpools.com/contents//files/88411298420.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/gagevu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/74d1fc2ff0eca48a79d49eae28298be1/51453756172.pdfIn PDF document text
    • http://elearning-chemistry.ro/userfiles/file/savekuwarorokenenafediv.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/61385610805.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cfc66ecda---kavovam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=exercices+les+polygones+cm1PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 10708 bytes
SHA-256: 5f39a684fbe13eb97812c16aeb3b56a21f39d06d14d85a9afd5b7044289d2e71