Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5efcc57c47353b…

MALICIOUS

PDF

85.8 KB Created: 2021-08-16 02:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6af52b949ea97517aa65d6842c87f9ca SHA-1: 5a98716e27ab0bc7980d82a6ecee7368b54aafd8 SHA-256: 5a5efcc57c47353b900d8da1cd636a24bca54f61b6535930b8952f0d04bbeeff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16088b915c5be2---golasanozenon.pdf In PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/31008111989.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5da7ae9174---vudenadexobibujosotipujux.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/botok.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/87841557323.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dcab7b6eaac---megebadele.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/44422304365.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15ec2b72f---luboguluj.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/lexabaxetev.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da69bb7cf80---15455327193.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1117c3937---57751075643.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41fafc5f0f---90253541293.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/32427724783.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/58mpv5scbk5mfrlmo465lc3fn6/46199712200.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/44660127241.pdfIn PDF document text
    • http://markone-tools.com/upload/files/sitesemabuj.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebc66985fe---61925593891.pdfIn PDF document text
    • http://hydrem.ru/images/file/2988647892.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b9b87dfc8---rekolezadigijilo.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/roripafe.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bb6debf72---67826776898.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/53677580049.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/diviverek.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/wakavanobifago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=list+of+words+with+synonyms+and+antonyms+for+grade+3PDF 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_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 11084 bytes
SHA-256: cba0095b422e620ce778a25a3c1418cee1383b6e9396284da5a976a010f30ac9
font_02_sfnt_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 17364 bytes
SHA-256: 40ddacdfce5508b8db6c24e3054026b60e722497026d8e6738b9f98ebfcfe90b

Open this report in the interactive analyzer, or submit your own file for analysis.