Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5919abf18f1be71…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 18:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a98b7e7b222f6988f271169b6fd6009d SHA-1: cafdb0a754e9be8c36131ef22bd6420461e0a310 SHA-256: a5919abf18f1be71ce49b87d06386ddf0c819a963d3efdf34e8a7cd070e5559a
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting it is used to distribute phishing content or second-stage malware. The presence of multiple external URIs and link farm heuristics strongly supports its role as a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=sophie%27s+world+pdf+download+free PDF link annotation
    • http://ciskmv.com/css/file/35333499744.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/4b5961706b5936999e6a903a1126391a/rekuzupefijekitozadu.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/70486395425.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b046161b2e---bigiva.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/fotamimelijibegad.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/59926591554.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/48ca954f2418e6f2b22fcef4d12db782/bakixin.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/xavirefukuromo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f858ce0a5---73187728654.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/47029636590.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/samipibilipabam.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/sixidadudelinunazer.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4d9bf1ba---87959466321.pdfIn PDF document text
    • https://eternalbliss.net/file/guforelidu.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/porogatejadowabixakutobim.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/namuv.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d352a3690e---gujigabifer.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/27994880206.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/or8gf6vqck0qql4ukcqleo3tv2/28346498928.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae424f79352---14629703147.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608291d4bdf50---43355187199.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/06415daf750875d1399f96c222fc1e86/xijivejomulemidebakur.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8300749db---zamefipe.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_off0000cbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10692 bytes
SHA-256: a9c5ea85668219678f24e53651ec6cfc335960852bdfce5358a0f13da19111a0
font_02_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 18328 bytes
SHA-256: af6404588dc0678219345d08eb105c3881e222c9267b4bab8808c4dca4a6f225

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