Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bbe0d54fa79de9…

MALICIOUS

PDF

87.5 KB Created: 2021-08-11 20:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f52efa70e0ebc9896876d7201d9013d1 SHA-1: 129bd7261e9bd94fab773276c0f350149abe9e42 SHA-256: 66bbe0d54fa79de9bcfcd84076c17893a697dcd533b1d69bb46b8e5e80dda728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of these links indicates a likely phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bc6f4c4bb---xurijupide.pdf
    • https://bayihoki99.com/contents//files/zelixupujo.pdf
    • http://infinity-pro.ru/userfiles/file/ludenax.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd1cee8f19---66913719324.pdf
    • http://mextro.de/upload/files/zumitore.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/7cf63a7579eed4d6a3e8e3864f591b5c/puvugo.pdf
    • https://luminex.pl/upload/file/94079913781.pdf
    • http://remont-elektro.eu/archiv/file/ximawepowekibupefituve.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b0a4ae72fe0c46dfa0650c593dda4c06/pusuzimibewiveroz.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/193c6398f448f5f9137571feb7319995/37619761267.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160984835713f0---sonowozezofisojuzuvikibif.pdf
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/vorabinud.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e56b3140---85951637746.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/3vt7b4726jfailqqbu98enq226/zetuji.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/oqse4h780acgfrkh7k0hbifb77/tenowarujutojijidanibabax.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2a7bd0e25758d392267ab7c5a5314431/pumulezanu.pdf
    • http://intergeored.com/upload/File/degonutexamuwolu.pdf
    • http://foodchemsino.com/d/files/fudodopeferonujetibesi.pdf
    • https://sportsht.com/userfiles/file/minadijamodulimuditodi.pdf
    • http://posicert.com/upload_fck/file/2021-7-27/20210727160003991996.pdf
    • http://brandnewgoods.net/userfiles/file/712278872.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac13e50a57a---211668686.pdf
    • http://www.gonouvellezelande.com/files/fenavinexelodeka.pdf
    • https://iqmuseum.mn/uploads/files/xasovinunav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=logitech+k800+keyboard+installation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000efd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 16792 bytes
font_01_sfnt_off000107e5.bin
396cd5ec282816b8ba4f7ee90eb9ab6ca5e17df94811ea7ca2b51344ca59b088
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 17456 bytes
font_02_sfnt_off00013501.bin
304a371f0b076866cac869da8de6e76019870f4a513dbad63754bf87431985fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13501 11280 bytes