Malicious PDF — malware analysis report

Static analysis result for SHA-256 922cdd2d31ff81e2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 12:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d09b9f4d5de8275bb16c7059f0d1a8b SHA-1: 894beb4923a1642ade689ea89de00faea1451eb3 SHA-256: 922cdd2d31ff81e200ce9ba193ec65a3cbe1095939b2e4ff7dae9d292384465c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a PDF document containing a link farm, as indicated by multiple heuristics related to PDF link farms and compromised CMS uploads. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs pointing to potentially compromised or disposable domains suggests a phishing or malware distribution attempt. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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 http://zonweringbelgie.be/ckfinder/userfiles/files/2510882553.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/sgq7qdabcgug7jqk2nnlh7m1u5/bolirewepoxejugofanatenud.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd82dabc2e---juxuruxixezusa.pdfIn PDF document text
    • https://tigapilar.com/upload/files/kitutizas.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/9922921618.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/makokojexuniwafemigem.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/ravufujiv.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/jikoxavutuxu.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/bevupowuzifunekubapasuv.pdfIn PDF document text
    • http://crm333.com/documentos/file/wotaxizorusige.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/27568681417.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/69654136387.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2baa75f552---tasokaxigaxulajowezegop.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/53601c26eaaa4d070e0d812e9e051d06/nekadaxiganoseson.pdfIn PDF document text
    • http://wwsm-us.com/files/file/33667539886.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16112e4b29a128---34768657918.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/591f300094883dd60b65bb24b39ad67f/51295643435.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/retitapalidewos.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5db10ed50---40492500397.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ab38aa1bf---9829654143.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/vudivisurukanezaroriv.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/visozinowit.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/28153710328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+800+most+commonly+used+english+idioms+in+america+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_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 11572 bytes
SHA-256: dab0cb45e12c24108c51a05e360c44f3b43bae58e0a810cf258ce465d98a5068
font_01_sfnt_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 18116 bytes
SHA-256: 502c103a6d78296b3c27f18d1d1c9bd48bb28d5bfe78999cd7813c6e57fc8279