Malicious PDF — malware analysis report

Static analysis result for SHA-256 f895b6440504f5b5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 04:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8ecc5a897f1a559b7e7315b8c2506ea SHA-1: f72c58ba6aff04f0379e54cee8aef2b7b48ec062 SHA-256: f895b6440504f5b5906e2a3b81ca44bd1f9bf79f7904c5658d91ec9272c527a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised or disposable hosting, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/mmrkb9hsfdqpn0eksq2k9ouc5n/vawanedadog.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/28006094720.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/43425886764.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/4597534713.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/31856189334.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/76897552627.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611fd4d9b4782---kogirusomevuwudedivefivij.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28f82e2d94---28747493130.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/59442704131.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/eaul9v5g6uqfs4te6j7c1fnu9t/wegekusunimim.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/44054591483.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae34e89d1e---xawejoja.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xoxavasiwasipoj.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/26411052539.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/nhl159t5f80i3q3rajlo7eqkpj/zisifagokomilupav.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/26958282026.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b2e7d41e32d28ac9a7d69f27b171e4e4/rufukagapexuno.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/43897116583.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771d4c6ee02---gamixuz.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/sevinel.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/9267ebf085a28d7daabcdfc1466ef6a7/16846343165.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/86688718624.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160913a4addfec---garefidimivodekuxonofeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=engineering+a+compiler+second+edition+pdfPDF 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_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 10948 bytes
SHA-256: 20524fca47e2eb3ce0d476aa357393988311ebb653b13eb15bcc446bca1d42e2
font_02_sfnt_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 17844 bytes
SHA-256: a2a926248b74ece59eb03d396c8933f5b1d220ded99242533fb01052ac0dfd72

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