Malicious PDF — malware analysis report

Static analysis result for SHA-256 5001cd56cc8ccf19…

MALICIOUS

PDF

88.2 KB Created: 2021-07-19 07:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19deeb764455cc9bb1681fee374d6c6e SHA-1: be7b53ebf65662a66f47f4f1d934b59577a0e098 SHA-256: 5001cd56cc8ccf19a191f2c9dc1c4b07de87bb899b6a8a84dbedca47479ad601
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it is part of a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the conclusion that the document is intended to trick users into downloading malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9317e2d1f---mevujetoreruguxuwuwoxo.pdf
    • http://stark-tools.ru/images/uploaded/32851765795.pdf
    • http://ezibra.pl/upload//file/kolalolu.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/dfc9856b717d01176c09bbe6303112a6/19358639372.pdf
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/54607831012.pdf
    • http://china-hold.com/UploadFile/file/20210623215904830.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/cd84d7a59e9a652907a0316c8ff3d433/25769421522.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/wudekaliwisodotexur.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1c33baa8---napatewun.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac1b21428---bofap.pdf
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/89081765709.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/edb747497b7dd84c040dd493d76ef7bb/datosezabofakiximutukolu.pdf
    • http://casaatlantida.com/userfiles/file///zutugotudekowobajupasurom.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f067880b357---duwogaras.pdf
    • http://tourbusan.net/FileData/ckfinder/files/20210610_58F7C3B27CE92CE2.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dnq6230fnhgqsmm9pcr8fq3vu7/18846863824.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/kiramevale.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/j0hthvu6og08ni4d21qlh13vc4/42356160298.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/uf4vslhv7vvoagf2v5327h1mc4/kepapako.pdf
    • http://toyteepee.com/uploadfiles/file/210619111139774241tkeir9.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0565km151tf1oolnh7mg9id175/lunivodusanefizurekipox.pdf
    • http://cncforginghammer.com/d/files/9328518520.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f09b805c1---gisowulijoripekedesule.pdf
    • http://petra-dario.info/upload/datoteke/22197931266.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609781a7f107c---93460846761.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/31c5f6138b7f809c607d26000425ca98/50583012825.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ip+man+2+tamil+dubbed+movie+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 16792 bytes
font_01_sfnt_off00010ddb.bin
97d57956fbf6ba4f1450e355a0f55161ce6411104ae942b8be62a902a6206a22
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 16948 bytes
font_02_sfnt_off00013a04.bin
b053e911fbfedf1f485b2ac4765694d24ba0cec4c041447fec43c3d6068bb080
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A04 10956 bytes