Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf66d2d703f1ef0…

MALICIOUS

PDF

82.9 KB Created: 2021-10-17 03:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0116622edea59f7b680b14368b780573 SHA-1: 5c6e7abbad109e61c9f6d79c6294de618409ae8c SHA-256: fcf66d2d703f1ef01c1436246a3d778236778548c038781ac9762562b59e5604
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to other PDFs hosted on compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16155a0f19b189---72210788961.pdf In PDF document text
    • http://a2hgghk.handylover.com/upload/files/39547064514.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/vidasetivukakoz.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/vipegek.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161666e111ddb2---21930910730.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/40210336748.pdfIn PDF document text
    • http://specialcats.nl/media/files/88550668755.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/7065514209.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c3bf6a4f06022ce7b243f3f1de6732ab/bifafemomimenowumedujebex.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/74884384227.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/20619536095.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/23896720063.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/45795355499.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/50465580837.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/75554985122.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/41565399025.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-3/20210903225119896985.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/96109037525.pdfIn PDF document text
    • https://shunnasato.com/molamizefojisenerun.pdfIn PDF document text
    • http://iphysiology.ru/upload/46183203996.pdfIn PDF document text
    • http://m2m2design.com/userfiles/lerijorapipetux.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/sekivenewinuruleviludabok.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/34773552548.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jevegol.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/u-9XGpgKpwY/uplcv?utm_term=best+midwives+near+mePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 17804 bytes
SHA-256: e6f80cc87a30395054b590f152e371ec75b9caa5879cf0eded8a7bdf355dd368
font_01_sfnt_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 10448 bytes
SHA-256: 5d7e02db81ac230df472fbe493fbdf9953baf4b25a824177e4343aa03a3ee982
font_02_sfnt_off0001263e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1