Malicious PDF — malware analysis report

Static analysis result for SHA-256 c828a7107ce9bded…

MALICIOUS

PDF

65.7 KB Created: 2021-05-03 06:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 413a7dc186a22c09ddfbbd90a8505772 SHA-1: da04ed2fcaa710af8286e086e932ba489d14385c SHA-256: c828a7107ce9bded79add6dd6f2b5870c7fa8e51fc23292c26564595d7734dd7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external URLs, many of which point to compromised WordPress sites. One high-priority link, http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd63c5dccd---lanegijedoledipetul.pdf, is flagged as a random URL and part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd63c5dccd---lanegijedoledipetul.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1f18586c52ded1cd5c3865a8c6187f71/62082275108.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e71f2c383b---36598228981.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/e7536953ed86b2ad2a8828763bb13388/niwexagefexibedukirarezog.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58716f09d---rizufomenexedixo.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/m2e1307jeje2vv606a8ka0pcio/getiwefud.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd2e642f64---40864261775.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8qcootvkpeb3vh32rrbjc8049a/66368277455.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160748a79f22e6---93019526791.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2518f228---20671301533.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b79ff087f24443b9f1547b4e23c134d8/waderamunupaveju.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/8da3aac5e5c2aa4b0f50a5327266ab33/xedexigo.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/75eerqt9ri7qucn1q3qu8ppqa0/riwemedujewodanegupegas.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e7508c9ec5b9f56aabd4ec8a587c1c43/9439286829.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/625ccb85445df7230ce76183073e52ad/lugokofamarifejudida.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080ef9cd81ab---wibixuzejinumabatofowiz.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/07941ac91bd18cda8cecbd6fb260ce9c/fogorutupivaponeda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hockey+flyer+psd+template+free
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d50c.bin
da4d3d86962138e30ee82217fceae9985ac0896b095a7eb97508ce85f57fbb42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 5060 bytes
font_01_sfnt_off0000e64b.bin
771c264b9915003058585c9697a2cbe0f7cbca0732557dd07d4933b8faf17450		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 10148 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.