Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7b3ff3ca3061a6…

MALICIOUS

PDF

88.2 KB Created: 2021-07-29 17:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad1a9c87ab1e15007f18c15d0e7026a2 SHA-1: 663577272ab74e22dd9889128fa5c87b1e776278 SHA-256: ed7b3ff3ca3061a65b149808e9a49920fb12df3cc08abbe34f3782d5bd9eb2f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the primary attack vector appears to be the redirection to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://krisoc.ru/uplcv?utm_term=what+happens+in+act+4+of+macbeth PDF link annotation
    • http://erulingua.hu/uploads/content_files/files/fexenuxesiwonufu.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857b50c295f---30448985421.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/pelusafuparu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8118ca2f5---naluxijemu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/18b8d34d42e5ed7415280d0fd6059fec/lenibedilo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be17c97ca92---daxesotarafitofugudadojex.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8eos6glnh89a2ibrqkvjnejad2/megegidakazubidimufawepi.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/23859625737.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a02b2fc6be9---xuretosubabeg.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/11272327720.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a867c6d0b14---8606242383.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/30945508256.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/lonazaforamogadupuridap.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbfcc71ea4---tosugame.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/xeparefev.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/29531194138.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2dd21e5bf---rewotixirurumepatuk.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/laxebemisewuxuzo.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/xikogemevosopozizuru.pdfIn PDF document text
    • http://kbchina.de/upload/durepamutewoxagipufani.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/55655624495.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/kilofulinujifutod.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 17000 bytes
SHA-256: bee6c266f57da3e2296f0150a7a32785e361f2cb1895f7a3d583b2b21c4e5623
font_01_sfnt_off0001222d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A44 10808 bytes
SHA-256: 054e8713d78fd08238a12aac71dcb049daae8628a1ec8c4507d11f74f83d79e7

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