Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5645ce7c5a3e45d…

MALICIOUS

PDF

74.5 KB Created: 2021-08-10 19:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 174e9dc359977bf06ead0d544cf1781f SHA-1: c20b7ac338305eb6440e9bbba4d8b2e7bed8fc27 SHA-256: d5645ce7c5a3e45decc92d222590c93dd8933be696d3454356249813a6353f99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to various websites, some of which are hosted on compromised CMS platforms. These links are likely intended to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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 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://chcial.ru/uplcv?utm_term=mtel+esl+test+prep PDF link annotation
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/kagon.pdfIn PDF document text
    • https://mmszke.hu/files/file/pixafol.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/f9lc38625curfj1gr9r9vicgf5/ladomekenuzupijopimiz.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7914d76f---72888775684.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/40352330906.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/17ce0de61cd1fe9a22e00781437076b3/bibepotigominuxejuwavof.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/furufujujubukapude.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef8c80ffb4---lapirefamaper.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0a8150e5d3b8c8084ec72840537dcf9f/59045687618.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc0a36604b---81677607441.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/60232978991.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/kofivu.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/mizanazebag.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/xitatomipebipajewu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74379b4ee9---dugunaxezab.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/24622335748.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/idi46rts0hcr7ena2k08kkrld9/29205810646.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/xomezojegewisuvakoji.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/r5ngjvt181adm1abgpqiput8e7/jivefasigenemavimewogedu.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/77586723605.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///21789908623.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_off0000c4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A6 16576 bytes
SHA-256: 26a9e393a9d543e27ce3a64be8bf8f5c81e4ad79314f739aced0f1284d3a3a22
font_01_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 9760 bytes
SHA-256: 2c5bdaf9914badad8466d7c3f82c1ee43ed35824dfb93bbfbe7e5fd1971ac0c8

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