Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63dbba8aaf0dbc3…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 23:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca363accf4429b37ae238f91cab42270 SHA-1: e2023634e9734ddcee5b032a54980524b447b2a3 SHA-256: a63dbba8aaf0dbc323be36e49f2b3318ff7f6f07f893d9ae5e250903eaaba4ed
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The file's structure and link farm nature align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://eternalbliss.net/file/83342187288.pdf In PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zixuvuwizajavemazorilituf.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052520493435.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/21471218043.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/wefudinizebomumilapila.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/xafufiwepodemex.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mj31q7rdd1rtk2vrmetv8k5hvr/kabubatatomezalufebogoz.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/wefitobuv.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/88383234968.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/6564278c6c177978a0e9ea611466f35f/64722534208.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf2a31b71---31878003707.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e8bae27d6---6421440114.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/36f9bd676765dc77582186f1896aa68d/xokegujifa.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/jagelo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f10462918---58040519924.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/2l0kg9k6lmd0dvui6nskin7306/87038655685.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/esvegrh109ouput08j7tddro56/wowolenu.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/3428121c7650862087d1eea5b2a0c487/dinumadevasimu.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fab3111849---kexuzowukivogufoxo.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/56834357104.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/zepuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=types+of+decision+making+processPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814cf276d38---mejudexejomusaboxive.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_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 16612 bytes
SHA-256: 341d2f52b33dea44cbdb23f541d958f7b7ad79e7d8bc3fe8287e9c4e8f94ba3b
font_01_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEF 10988 bytes
SHA-256: 3194df892d6324d9c5cf7336dcb0785bd6a713b87207baf3ac4eba340882f017

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