Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b4903ed9133d1e…

MALICIOUS

PDF

96.4 KB Created: 2021-07-02 15:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 657590de164bceec1dc5822d6de441a5 SHA-1: 8018846554a69aa9e6ec3a5fb1e3ba68e29e31c5 SHA-256: 89b4903ed9133d1e506459a7d257ae5333d3d95d95cb60e4964945e5dd8d7b23
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which point to compromised WordPress sites and IP addresses, suggesting a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware disguised as legitimate files. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://inimtrento.it/userfiles/files/61161792450.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cl5k3be9iqurgn9ffogh1tmf68/61464154536.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105160105.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160955441456a7---12159122599.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/nezokexemowapinunew.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xinoluwelosu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/32907db45b8023a3658f1f60c2cb9c08/rupufavirizudeniponazozo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc147dfd7---58250703327.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/jolikodomuvakuxa.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/33316344641.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/60690509654.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/5d77dddde0cd0618ad68af11abeae4f4/2083639488.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/13109328399.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160cab4e9c2e75---46801476026.pdfPDF link annotation
    • http://broadgatecapital.com/userfiles/file/wagogafikotumixugepafiro.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/kerupobejix.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/b76qn1mrchcjf7o537ojpbfkm3/92937190972.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/kiwovelosefu.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/sadolunafabolitaf.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/fonubefe.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e804d75af887011bdc53e85f19351f37/37362420461.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/38107680182.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23ba891095---81114341022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sharepoint+designer+cannot+display+the+item+workflowPDF 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_off000113a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 17480 bytes
SHA-256: 33795cb944a2d14985581e477077b0f40f423b948c5b9330ae3dd45ed92f5498
font_01_sfnt_off0001416c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416C 11436 bytes
SHA-256: 0ee6bbe33c8ba9bfe6d1768319dbf5d0be9d6f5d3af7afcd3dd315757d79d5ae
font_02_sfnt_off00015c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.