Malicious PDF — malware analysis report

Static analysis result for SHA-256 2104a783bd46b2fb…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 13:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ec637e819f3cee3484e89c34c1d7c40 SHA-1: fe828ed63c1c742a7d9311c92f83fa67d2aba452 SHA-256: 2104a783bd46b2fb8ae365e9d3684a4640d5a4eae146c002eee0a878b49c8eac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.kindspring.org/inc/ckfinder/userfiles/files/92390802057.pdf In PDF document text
    • https://angkortaxiservice.com/userfiles/file/zetoxewonupizadanuf.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/fetuxasutiluponumadedame.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/380e1c8d8cc57c3e4f3690b3621d4c63.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/xudetadoxekowipepojuwam.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210908114307.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/8097492733.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/721ed260aa5a67d8eb7760c9c4085cd2/nozaleliz.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4ea61584---jexegebamuvadaxurawi.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/95939977412.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/9177959506.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/nuzufotafinudume.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/14834427a380b88d3f4330fa7d540c47/15532907049.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/88288660288.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109151512006686.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b91d230ff0a2f5f9aa4aa1b782668e95/ridelewalibogawubovako.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613655c69e52a---34041387263.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/pupiwejuwanejuved.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/67165829843.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2aef9fb9f1ff62751eee4332f7b0722f/2119595160.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/070151569415.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/lonavapepojudasukaxifo.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/73716400107.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109102315458720.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/jadudamidowujegufudu.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/4518937427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=yify+torrent+tv+showsPDF 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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 10352 bytes
SHA-256: 0ce33041660b10445a184774eaeec5f8462d00854e7a57c0da852207fc426386
font_02_sfnt_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 18032 bytes
SHA-256: 6495c73a10429e6f49f277740420cbdf461741114ab2ce507fd11400ac347c36