Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8eae6b771ec0ab8…

MALICIOUS

PDF

64.0 KB Created: 2021-09-29 04:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 839f0135f95bd40154f4c544dc5546d5 SHA-1: d7d499511a0cff32c67118564dd53da05b358f9f SHA-256: c8eae6b771ec0ab8d67243d52747ff287defa635da56b07f1f076e1bf6f91de7
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this malicious intent. The ML classifier also flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6133

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 http://mebco.ru/images/file/72954990133.pdf In PDF document text
    • http://studiolegalebisantis.it/userfiles/files/magezexupolukonopibukopa.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/rogizetunifokizipijokisa.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/37871283317.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/90837346108.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/rixozarejevem.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/5e811c56fbf724f5d73b9c0d3eacb33e/80796812571.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/35078266390.pdfIn PDF document text
    • http://chongros.com/userData/board/file/fakogadinibugefejebesud.pdfIn PDF document text
    • http://forestheightsgarden.com/ckupload/files/wewuvigamu.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/59639461448.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/sejumivape.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/68951688153.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614acc81c6e01---52985037888.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/49167392617.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/zijukez.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16323375532908.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/43arfb46uijjru9lj77rglvfq0/81072566768.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/32370547171.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8b24030bc9b2278470751c16e5f345f/vexifibejojepa.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/digofelifob.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/7519789011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+seven+stages+of+man+poemPDF link annotation
    • 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_off0000acfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50F 15032 bytes
SHA-256: 4607ef24b9fffc3b554e14cf2141113883be64a1489c9ead66bcb8afe388ef0f
font_02_sfnt_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 10596 bytes
SHA-256: 39a5d3a5e26d25e8d7546461f3bf5db35be9b9ec4a5fb91f8ec5b94087c312b2

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