Malicious PDF — malware analysis report

Static analysis result for SHA-256 386cefed4aff5843…

MALICIOUS

PDF

85.7 KB Created: 2021-08-03 07:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4a61867c3a0dc91b91ed8ceea897bccb SHA-1: 7544d49f33d9efd26bfb3239244175851a765f23 SHA-256: 386cefed4aff58434beb073c8ef63b0f7de4d1e6c8bfb16c464c5d8f08d645ba
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, indicating an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous suspicious URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b27801bca1---70498724549.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609733368c10c---80198192756.pdfIn PDF document text
    • http://airfa.it/userfiles/file/42714580860.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/68386527538.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/28887567523.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/lalumigananakeserin.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/db22b63d38c2f52b80470f74831f6be3/73950600377.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a5ba381f---45109662051.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf292078f1b---kowomi.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dcfb9c2b75992bb803fa172a46b7431d/43188980575.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16104d05b0762f---64936001195.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/rexokatekivetojaxatot.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608360c10ee7a---93728659248.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1322556039608c0f151118c.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38d8t0g4ugg2o2tfbotapc6267/71603610375.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/58130942802.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/mugesutewurabajad.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/rj31q0samcd45qtniqib442t9l/34561110758.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f74811c4f---39631845353.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/67480551792.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/jipawe.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d018a4a06---nitiguna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+check+error+code+on+frigidaire+affinity+washerPDF link annotation
    • 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_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 10992 bytes
SHA-256: 49a6442ba765967af68909e8e40afb7c25955efe4b76c6e6cb0850d324361078
font_02_sfnt_off00011b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 17000 bytes
SHA-256: e2e0d41dc69b7a986438fdd4254914053e67d52eb749181665b706b37d89279b

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