Malicious PDF — malware analysis report

Static analysis result for SHA-256 d684d22081eaa7b2…

MALICIOUS

PDF

77.6 KB Created: 2021-08-09 20:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9aa60b6788bbc8cf25a9637f9b2176b9 SHA-1: e2fe741871ff556e426561d785c74191a88ef7ec SHA-256: d684d22081eaa7b272e97f466849ed87b9f79dd4a02048a440e7bbc67b3dc967
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within formcraft plugin upload directories. These links likely serve as a link farm to distribute or host malicious PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7755

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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94472e7b5---nokuzekaxusabefor.pdf In PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/jozudezesuvekoponuwedes.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/21653740042.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/movomuw.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ace8aa292f9---jirodowusovifinatazipab.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/98705552178.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/ketoje.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/89880092576.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3edb9101d6---7378974461.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/72099599293.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/rowam.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9cb07f8d---80390770255.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a2d5010afef2f88a1a646c7630627d16/97436809644.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c774d55a022---tijanafe.pdfIn PDF document text
    • http://unseretochter.ch/images/file/bazuxuzuradejapujerugule.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d91b8facf34---jenusozexowenav.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac6b6a7f9d---5478874007.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/025e996002d23a63a511a926fe1420f5/96107517550.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/eglr5mkalopssh0mjh2f6t3v92/65346885056.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/zusud.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ce2c09ba37e47ed6b62274ed172f2cba/17415731984.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/4tl1h9faspsm3lold9cd6c59dr/57121890366.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/gijifipajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=daemon+tools+lite+version+5.0+1+serial+numberPDF 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_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 17072 bytes
SHA-256: b44095f9d1ec0746473d8a51929faa564e3f65cf4c2255995afa3623dea0b2c9