Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1ead7308a2acf9…

MALICIOUS

PDF

114.3 KB Created: 2021-08-10 06:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a7392c7e7f22a07276e7717aabf6281c SHA-1: c976ac6c21542ca87aebbfce8bb7ee7eb3a96644 SHA-256: 5c1ead7308a2acf91aa02e60678369f9de1b21104e4ce918cca045f1cfa6f827
162 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated maliciousness. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress installations, further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7530

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/lfhir2orge50nblu19f5vp6fj3/zixuponubupeniruzazi.pdf In PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/6477209201.pdfIn PDF document text
    • http://ropesadventure.com/d/files/35438562019.pdfIn PDF document text
    • http://yjccnc.com/upload/files/60204762421.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/gigenilewutumuwif.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/afd393f8455b9ed449fa283980f51ed7/gibugoxulurase.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/777268bea6ef5aca3bf2b0961e85a10f/71124370005.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/tujoxokuwudewafajufa.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/darozolowuzufedusen.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160832e2aa8748---69151660527.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161117a21765e6---27670945819.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc379906509---1254327820.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/nebexafubake.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8047235851.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/genamukeduximorimefa.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/365209fa4cbcd493f11276a11b457a7b/99793435134.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/wupuwubowavifesukuxedimid.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610340d7332a4---fulimomali.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16079528b500d9---repiposidudosebir.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/feab79f141e116bb808394a74a35384e/batawofijosovupekun.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/ef50d598f050e20bc97d69eb58488ff2/juzagituximew.pdfIn PDF document text
    • http://short-story.ru/upload/file/23286724722.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/63984608090.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160860a08ce856---kimonibuzudijafefusovos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=when+is+the+next+firefighter+exam+in+massachusettsPDF 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_off000171c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000189d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189D6 17452 bytes
SHA-256: c5135728245e6845b19bc1f0538629b4e45be95b76efb51720bd9235ff4d5c4c