Malicious PDF — malware analysis report

Static analysis result for SHA-256 658a9c3241b265f1…

MALICIOUS

PDF

75.3 KB Created: 2021-08-11 16:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b8cca799e97aaeaf29aff47554b7f2d SHA-1: 5c9c8f410d530561453b6dd9936cc16c9d079f0b SHA-256: 658a9c3241b265f1ff4cc32f897aa58c861faa5a52ae562e3e837333ab51fdd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised websites, suggesting an attempt to deliver a secondary payload or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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://drafthe.ru/uplcv?utm_term=linear+algebra+and+its+applications+4th+edition+lay+solutions+manual+pdf PDF link annotation
    • https://aptitudeclass.com/ckfinder/userfiles/files/70448945236.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3ml1iu5ntee2ihaadk8h1nloqh/lavesarovuxopajamememujev.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6076ebfe51---53644570812.pdfIn PDF document text
    • http://packamate.com/userfiles/60657681288.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/458fhnhrhheduqs92k9271vkb6/visokitorerebugakepagu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/drc912va46vin557smuskbc3m7/95313695527.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021061107241853.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/61337954736.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/23321079515.pdfIn PDF document text
    • http://ty-int.com/files/files/nosazigazuwozod.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/vaxejenaroxebel.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16082acad6a2ff---zafopox.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/35777478734.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/gejes.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/42149996354.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083910c3cee8---63137220119.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8998059ef38f72795b6da1a9d8c0cec/63987743813.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/paditizujebedunikameto.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210806214931.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/22803912964.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/dunugosuwamipisofilemomi.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/21767867031.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_off0000bfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA5 11456 bytes
SHA-256: 3c183758de7d383f235fb7957624032cb0e25e92b09cfa0622954dfb019965a9
font_01_sfnt_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 17488 bytes
SHA-256: 0b4f8033c7106504ff7e07ffa9dd19f05b0790ae626e9d0cded98f9c1c140cad
font_02_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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