Malicious PDF — malware analysis report

Static analysis result for SHA-256 89efd2b66305515f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 22:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b549c10d63574e1aa34e411574cb52b SHA-1: 72fd217e7d6904f86023dd3d376dc5632c705c9e SHA-256: 89efd2b66305515f37b743e47eb4fc13525edfe976643762dc52d05761df5de8
164 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and numerous links to compromised CMS uploads point to a coordinated effort to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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://synerhu.ru/uplcv?utm_term=o2jam+music+and+game+apk PDF link annotation
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b6a24ad628e9eb71c91626095140730d/naguborefufosavizodopoko.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2715b5c18---80922951803.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/76986286979.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/rukixonivetanu.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/73622953644.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130453d3c0cb---zumemutolonedofewexutowe.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/65304379829.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/xubawagorukiriji.pdfIn PDF document text
    • http://vhshf.de/File/kebarezijalujukexudo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613e66992f2c8---42371495356.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/287a7695ee9062652d365920004ff25f/validapezinatigilisamewu.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/94571483077.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/84611420038.pdfIn PDF document text
    • http://calisnt.com/uploads/files/ludofobosasitujixev.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/regemigaxumuvizujaze.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/bonasizadepewokeduvurob.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/66173682051.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///29701704378.pdfIn PDF document text
    • https://binhvi.com/upload/files/70197570015.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/jimibetabilazezewudiluzeb.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/68599482820.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/14224439685.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/nojoxuzamujagejat.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_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 10960 bytes
SHA-256: 22436f97801b863ff98fd41b66767250f2ab032e7bbd8bb7a90b4f3fe7b59331
font_02_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 18520 bytes
SHA-256: 3bff3301db9873a03905aee488c613d44edaa7b63edee1261ca5b065d7fb77a6

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