Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0455629a492fc5…

MALICIOUS

PDF

64.0 KB Created: 2021-09-01 02:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42dd63ad724089a12f33bcfb60dbaaee SHA-1: 4565d01275746e103390f01a86ba9d45c60c0ca2 SHA-256: 5b0455629a492fc54922bf934b61d1105b5748afa8431a5a0e095cac406f30a1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious content, likely a phishing lure or a distribution point for further malware. The presence of numerous links suggests an attempt to create a link farm for SEO manipulation or to distribute malicious content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

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://archism.ru/uplcv?utm_term=billie+eilish+no+time+to+die+piano+notes PDF link annotation
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/l31vp4b9q3kvf6388c2snsi1vn/fatekuja.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/14ta5afq2jof8mn9ko8h7fd36e/ratitukewar.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/173b9a3b551325c7ca33eec918615b5a/31407161425.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/buzorodewebadewiralebisos.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621490514.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/bbce3a1b9f9591047eccd69a9b07155c/riwakukajikajubolamiror.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/80c0da4299d43f90ccefc855e398757c/jewelogusob.pdfIn PDF document text
    • https://ambalatender.com/upload/files/nosenutafupej.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607729b546b80---45729806358.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/legopopo.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/594a614c2bda4fb71954be4c1c0869b7/kuvorizil.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9cf4d24b9---3499760257.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e5339e42---pupujov.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///18032562395.pdfIn PDF document text
    • http://huntland.hu/upload/file/wogir.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820c9d2d758---87318899004.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/29673396331.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/famavojinevanomujogo.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/vuxutarur.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/55617900345.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad44e8ce5---vejimix.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/wufin.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/jisamojilanuvaratatij.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/18275075342.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5afc8557d26d60fe687fdfa6b303da64/30946794174.pdfIn PDF document text
    • 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_off0000c7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F1 10608 bytes
SHA-256: 5a42a8c0a4118997e9229f28fb8ac6e26f0ab86a301dcfc73619290bd982dcc0
font_01_sfnt_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1