Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55985cbdc00b4ec…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 02:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 947f4a238c150356fa8922fe92b3423d SHA-1: bbdeaebc3b277c31e03f088ffca12379db1cd2c4 SHA-256: f55985cbdc00b4ecfa12e8dd97020e98792c36449c5d35ce9da862546cb2b11c
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the nature of the embedded URLs and the detection signatures imply an attempt to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6820

Heuristics 5

  • 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
  • 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://sesconbs.org.br/ckfinder/userfiles/files/vefokobozazadawexejo.pdf In PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/dugodukenil.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/de24d56dc6421da6c6287fd54b331854/bapuwarugopagema.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/69914881566.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/nakejotodovezula.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/64964792890.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084e11d87c2a---41896261082.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/3e76da672159e517f162f12ccc6c648c/wokaku.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/gonubitusixabagewi.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/zelaresonobalagodu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25d35b32aa---wutolotezebanafo.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/talufomen.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/2621697781.pdfIn PDF document text
    • http://goref.ru/files/file/27759379508.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/tewadupukumip.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/72291677834.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090284033019---saladoboxejijolokugaterof.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/welibalodu.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/44475596087.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9660173463---wofesilawoxo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/jixatubenetinupujolot.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/59b92df481f74b8c98d6f6d53ad7122c/favesuwobefuluwiwan.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef0020689e---kevemifasodevuwug.pdfIn PDF document text
    • https://wrd13.com/force/file/kiroxuzazezosenogek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=domain+class+diagram+for+online+shopping+systemPDF 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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 17380 bytes
SHA-256: 784095938ac4e5eee512090ba34b4937607326573229b5e33199764041a939eb
font_01_sfnt_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1