Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4ecd2e37af1b4f…

MALICIOUS

PDF

143.2 KB Created: 2021-08-13 12:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0ca1988fc19ec61e6a5d00b7ae6f30d2 SHA-1: da0da3bf94f5ced866802eb494ca34b7d55774d6 SHA-256: dd4ecd2e37af1b4f558435d53a604698492560325d2564f91a2d205ca6f3186a
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff96ed6348---vasamobugurazapat.pdf In PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/37075785883.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/14132755402.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3308308326097027c7fae0.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/d5ts18c62qc0eam1g9qeun1qv2/7734762770.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/jovigopabubepabufiwo.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0404dsfe6v3jni4a0ve2dqd9tr/lazabukamelexafeje.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/55952441210.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/76042783162.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa56f60079---sobewisigu.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60baf36cd6038.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b301eb355eef0e584b6ab2b17c7fa6ba/49845547637.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/xazasuxanada.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/39784669016.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/79712849494.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210805234831.pdfIn PDF document text
    • http://bakoca.hu/files/file/92162071260.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/tuxexadepegejida.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/10390023319.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/gefavijisir.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/36437607057.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/jemolenudisitebu.pdfIn PDF document text
    • https://0900107678.com/upload/file/43684455603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=un+dia+de+estos+gabriel+garcia+marquez+analisis+literarioPDF 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_off0001cc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC82 11168 bytes
SHA-256: d20dbb5769d52dc5c603c5ffe178d2b2dc124376d4a5fdbd74f98bd2a265fd19
font_01_sfnt_off0001e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E61B 18988 bytes
SHA-256: 5f33e38d01ae195cb360dbc78bdf63078c20413293800e9949d97595ceb05cd1
font_02_sfnt_off00021629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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