Malicious PDF — malware analysis report

Static analysis result for SHA-256 0679b4b62663520e…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 21:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e1f9a16e67dd66d468ce2cb5e8ff1104 SHA-1: cd5d9ffec88a575cd128de418d8507e83c8094a7 SHA-256: 0679b4b62663520e0520a8eb04806d9a4cd7869153eb034f730a8bd3cc58130e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/01be30872adf7c905c1095d3d0e59bb3/pajiweziwisepumiwumuw.pdf In PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/7us7huqar72pcmqke3nal5bme5/48930765279.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/mivutijefowajo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabd59c466---14481486788.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/57464b2cf3f3168f99df171d418846ed/timinapinizunujogerop.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a75aad89a0a92c25f5310aba57f7dc3b/vakivipodetow.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/sizaxofekubenu.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/pafotexaxiwewe.pdfIn PDF document text
    • http://bronia.org/userfiles/file/puziwisirazuleliwaw.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5d532cd4018f5013e7e55133436f09a7/dugikubedufekok.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc8d64c987---81189387687.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e624d82c7480114750b76c66964c8b74/18182189641.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4d5ca1a647cc6792ed4f53965e216b89/zajetajejezonijej.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160872ccef2b13---36807258539.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c12544a5c5999a919ade807f47d8b596/9412235796.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/28198969167.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bedcbb0f08b---98717028778.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779a5bcee1a---95802834800.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/dezumavixurunasevomas.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/zewulemigirakaf.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f813eddae513e855f705c2c8d002173/wodiwikaranapolijetitusu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9dd75f6d5---94837829458.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8hu4chgd402h67k1vc9lcih543/fidumuwekaxanopunote.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/sawefobuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=chess+rules+and+moves+pdfPDF 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_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 10768 bytes
SHA-256: f3c6f271eb601738b786ae58516574ca8311a62426294d95be66d8681edf9b1c
font_01_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 16852 bytes
SHA-256: d97cab4a196a16368508c8db639b5c354f7f88a7aeb10274dce5a21486f78820
font_02_sfnt_off00013976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1