Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37b232a9afd8640…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 01:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f8e897ad83588235e00297a1ad239b6d SHA-1: 7d5d0fc17a25ead142672ea485b83c1e0fc30328 SHA-256: d37b232a9afd8640068a0f14b3b59cccc44cb25449d63340ab6c87f7da1f84ef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The primary attack pattern involves directing users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://coretry.ru/uplcv?utm_term=trach+in+the+throat PDF link annotation
    • https://study-abroad-travel.com/ckfinder/userfiles/file/mufarepu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kuvamupibemojerepudo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe5ba5aa49---66021671621.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/u37klsfeqhagbrh55a9a9h2vfj/sivivajosagidaladiba.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/71485df2b5694aacd2ebba91c6aee0cd/vapotixefifan.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/l3r306sndie4gvvrnvqg2orqph/bazidavodakazomezowo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/sfb2sohr9c8ohfikdfpbj7vt8a/48688657922.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb10837d3c---fotipifutik.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/kakokurudilas.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/satizizokosuduxojuxozu.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/jowupaxifalibifegonol.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3fb817640ed9bd93a1dd1746008e8572/gevuf.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160823f784b56f---62128394721.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/nodonoba.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b198bdcf8---50180278291.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/eofkj9pu2ots2s8bfhj1ajr1hb/juzefetexotuleje.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/81348923856.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/5564273933.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/344e59685c0e552b86eff9c35e02aa5c/dagikikusifakotimibiz.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/9f162983df1dd2e25d2ebaa1f7c066a2/87573909939.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f36c52a8c4---nisojuwi.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_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 18644 bytes
SHA-256: da29726ae90fcbd2419143f97ba00c4419aaf789a7c1926839fff21c30931363
font_02_sfnt_off00013033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13033 10076 bytes
SHA-256: a4f53ebac07ae537e2eec36a9c0a99d2cc55ce38c7b17e211f09ea20b7f39ef3