Malicious PDF — malware analysis report

Static analysis result for SHA-256 3956cd32d6d15c00…

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 22:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c1849894d9315f174b45387a49c43db9 SHA-1: 852c679d9126cee0db7bc6387bb62dd6fae4c71a SHA-256: 3956cd32d6d15c00eb3f4a49a4fa17c1ba6fc649ce54eadb2e29aa88f7b89e55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The structure suggests an attempt to lure users into downloading further malicious content by presenting a collection of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://aroma--style.net/files/files/faburunexekitotexejabimiw.pdf In PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/pebiwogiwitonamezefexo.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2494a104bf---26259927991.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d384c6f7a3---laguxokeg.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4272c214c2---90829905841.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c327b13d8107be439fdbb65b8497e15/74075200267.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/fujaguloxivupuvizodurura.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/fivogorakilipedinige.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b927613d7b9---99480430372.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/11608437411.pdfIn PDF document text
    • http://brlairport.com/images/file/gefanewododatelad.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160763fbc7b293---posiku.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/nidukoboxojabapaxagib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc1cfc3099---98557773878.pdfIn PDF document text
    • http://haki.vn/uploads/files/60617732179.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/sibubopazuko.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/juvesazotabakib.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/bokaridejij.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cb7c6194---xufaridupewed.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b65a18a3---79967711857.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/lelikilutavoseduxexuk.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5eec57cd79cf04d621381df7a076e3f4/galujivelavuvipimerane.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/65fff79c3c40e0cea2ecff86f4ce6a91/57478537191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=14.3+ideal+gasesPDF 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_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 10272 bytes
SHA-256: 5c60454386971f08298ffb6d1d4fcfecc7a37bd0ef838fac6b78ab184fb54894
font_01_sfnt_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 17560 bytes
SHA-256: 3d3e2ea4b67f7759f957d206dbd6bf494e5eca2495e38149e7d8028145b920b4
font_02_sfnt_off00013dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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