Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cc115c8f84eeb5…

MALICIOUS

PDF

80.3 KB Created: 2021-08-09 03:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0043953c9c471799398414087338b13d SHA-1: cf4722d9639161d5b9aab0a8468c75c86294d960 SHA-256: e4cc115c8f84eeb54f2878f55bcd12a4dffeb30916f7d37d3d2c6050bd9e8acd
164 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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=interactive+hundreds+chart+to+1000 PDF link annotation
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae201f3a228---sijowu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc755cdd26---ledivuwuweburiratisos.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/92444489874.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/tamuvovivunikokudolazem.pdfIn PDF document text
    • http://okun.su/upload/file/8059799778.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad471a32d33---zepamibo.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/xakalizubufetunem.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/1268b3lc7iqi23alj5kljh812e/zipomapakonut.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/70c0d56df7c407a51c0e0d8084b2e2fa/vogatamum.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/46981321822.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/vadowadilege.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/55371294769.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/67520930467.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609143d1e6577---563503634.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094c452042d7---pagupubefi.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-19/20210519070040183007.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/wuxowesijo.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/zidiposexururolewijunalak.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/2jkd6pf6flpfou0scc712u594m/xaxegub.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/9499044467.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-27/20210527051925414720.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/71473162221.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/92862052119.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081ddc134b96---24199813586.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/luwodevupuderuv.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_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 16968 bytes
SHA-256: bb3371b3bbf44dbf25812f92881515c9469403c6c0a70ff34f9828633ef55a6e
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 10712 bytes
SHA-256: 726f306d817f4094f5dcb7e919f712578a6d791ce90202782ec7bae6f7cf7383

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