Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa4bf068e393adf…

MALICIOUS

PDF

71.2 KB Created: 2021-09-05 10:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3a215443fe81a7c6e0de00ef9cb86ec SHA-1: a2e74b066f51dd683b0cdcd352b1c3bf39347279 SHA-256: dfa4bf068e393adf3063d0d2b9b9281268db48f619fb01aad6a17983d53eeedf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=printable+worksheets+for+class+1+english PDF link annotation
    • http://candientushinko.com/images/file/sisuwosepadabipi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c0b3d39f4---maxurabazoputo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160813afd45bb2---zumatokuxosujaj.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/22130562565.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/sixevowefisizefokabajes.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60BBDBA6AF6A0.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/97955570235.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9fc0c0ab37d17f128278a2a11937a897/3515959150.pdfIn PDF document text
    • https://brakos.it/file/xijifezowomabuluxer.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6757e78f0df4b2fe9d2457735991ccc2/35475403876.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210825235716.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/69639886158.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7dca7c8c9f4c81d597b4fff106a1b6b7/77394249919.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16098f2407a2c9---visavupojepasada.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/jawejewezifalijewibilat.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/89828865721.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/71384769392.pdfIn PDF document text
    • http://bdn10.cz/files/file/fejujuse.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/venusukesugot.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/wekagajolurivowexamakafut.pdfIn PDF document text
    • http://bienbao.org/uploads/files/neretuw.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/af07e105c77d3166b9143ea8545bced8/73932736634.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c278acff1---60169169845.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_off0000b6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBE 10988 bytes
SHA-256: 52216405455a734003dc11ad78698e8e0a582a014e992b85375f8fd8fec8bead
font_02_sfnt_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 15396 bytes
SHA-256: 61b6daf56a254871803fe0297bfe8802306bb9632be4a9d866a00e23bec9e85e

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