Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7dbcce743a31c9…

MALICIOUS

PDF

86.9 KB Created: 2021-09-02 12:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab72965242e3b05cc38a8dc74dbf3084 SHA-1: bc4584433b7d57fff8ea9cd640729bf0464be226 SHA-256: dd7dbcce743a31c9b81617466653e280462f8d182adfe1f715be22bb2699bfd8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The sample is a PDF containing embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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 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://f27szerviz.hu/upload/files/vunonumuxaf.pdf In PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/58005539539.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/gomizelagefuga.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/jubepudotozaxutafitewabu.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/89283619358.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/kosagewimivusutikigito.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a5060187c401bcc8e6510cf7598a5418/69224398587.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/kogimijutibem.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa591cef6---fitezevadubenebekatasirak.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3750157162d4145cf5f38311fd12204f/29642530908.pdfIn PDF document text
    • https://agermag.ro/mm/file/tiruzo.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/79051152448.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a80c97ba01---bafizova.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/muleguxixujo.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/zetojiz.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/29127553156.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/72gaijeadlmc6vlaa9t9n7blek/xiluvowe.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k64ved5n0bon6jkf865k15jnv6/79047959071.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/544s1ogqc25oi7qjamma4celiu/78820161857.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/61514627262.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/18437196962.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/rarafotiwa.pdfIn PDF document text
    • http://geose.ru/userfiles/file/44082003832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=arrl+antenna+book+17th+edition+pdfPDF 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_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 19092 bytes
SHA-256: 19fd894ca9b9fbc251704157fc96db192c9952f2fe0fa0b9150c34c900a85b9b
font_01_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 10740 bytes
SHA-256: 19969dcaf3262c83c76a27fd0be64fc032adccf6878897324e4a649a6a47110e
font_02_sfnt_off0001360e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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