Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b865c5fc7c134b3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 06:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e94b8737b1d3622c0d26a3d15a43a709 SHA-1: 3181011ce8d4a1a7f1fef98273a45c1b88f55a91 SHA-256: 2b865c5fc7c134b397b6aa8ce38cdbd4dfb9b280ab677d22073f55392d4ded20
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of ML and ClamAV detections, along with heuristics indicating a link farm and potential callback phishing lure, strongly suggests malicious intent. The embedded JavaScript likely serves to initiate the download or redirection to a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://batiment-tunisie.com/userfiles/file/pivixadavibiwuzuwelor.pdf In PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/dadumenitodiremirafur.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/zonewesosi.pdfIn PDF document text
    • http://delve-cr.com/uploads/51472449635.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/dawobinudokanunamil.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/66023744741.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/34079097024.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/5843624284.pdfIn PDF document text
    • http://ned.ru/uploads/files/26452096765.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/kci60vvgobu9upsmaaf7d1gl42/73819848399.pdfIn PDF document text
    • http://ruresept.ru/files/file/19420000968.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/22872752219.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/95658157900.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a728e46b4---biwogi.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/56183831554.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080af11f1557---19922749510.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o516n8h1105g752280o03pvr31/famivav.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/gemapipubilipisolavizaxip.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f2dc694c4b19cda25ad5e8ca281317bd/79303465770.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/73246821506.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608107df3fce8---31028700840.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/siwagasajopige.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2710t1u7phvhc4ti4ol6gn78da/magixesitemelowevalin.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/nosilerokagovimiduxut.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/71815c8aca1fd8ea732768ffc055aa23/fofopufabubimabarotaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=banksman+training+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_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 10688 bytes
SHA-256: e3bf0b8836b5fa5a1ca8b7080816c559c8eae199635b3d0625937eea62400418
font_02_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 17648 bytes
SHA-256: f306e69bb494c42d4d69ba3c325bd44a6f9ae734bfc5e21be37e155379af0d2f

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