Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5747f9c41fe588b…

MALICIOUS

PDF

83.7 KB Created: 2021-08-02 17:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d27cf19255306e93a093072e38b63dce SHA-1: 83d20045da7600177fd42d4704c68c4b6ffd9b60 SHA-256: a5747f9c41fe588b15b48706af692ff4138ac2b9122ddec656e0a1e9465d8844
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including one pointing to a raw IP address and others hosted on compromised CMS uploads, suggests an attempt to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be part of a multi-stage attack involving password-protected archives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=ejercicios+de+suma+de+fracciones+con+diferente+denominador+para+quinto+grado PDF link annotation
    • http://tivati.com/uploads/userfiles/file/lakikepoluxobugigoto.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/nudunefuv.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/neranajukelujaxu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b3a171ead815966250cd4c4b4210d3ba/34371802700.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/rivuwafizegabudep.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/jodaruxagutejerefuligina.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607650d6b87d0---gomuk.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/53220494782.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/66101371527.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/873ce381cfbe75dabd3053f7a2fbc851/4180136405.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/wezofovobosorijip.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/35453393591.pdfPDF link annotation
    • https://abeess.com/userfiles/file/88434477674.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bc11b4e36d9c84b895841e382f14b2e2/80018563713.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/12014357991.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb4a0dc00---19581100043.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/junowunubowimo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c575ef0bbab---pogipipopadajelotaba.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/85676807246.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/xuvebigodebuzu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e7bc65ec0eda7cc9ee0dd6309dacef09/tenoxawi.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/32902779159.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_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 18452 bytes
SHA-256: 23d8a8a6b425d4b70695536413c8a3f849bd2640d07aab464d731094c95caaf6
font_01_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 11276 bytes
SHA-256: 5402073ec871a6000ff00773e67991a273cce4892017cd19b0d8c4f5a5c570a5
font_02_sfnt_off000126c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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