Malicious PDF — malware analysis report

Static analysis result for SHA-256 54aa936d3d4a20b5…

MALICIOUS

PDF

70.4 KB Created: 2021-09-05 05:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3ca659d753cf274369ee716886115d9 SHA-1: ab97c1154ef9088785ff0343e7321679c71c7035 SHA-256: 54aa936d3d4a20b528e4eb7128b87e41a1023246510734df17ac586ea37684b0
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external sites. No scripts were extracted, but the overall structure and detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b64446293cf---57777491618.pdf In PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/r0vk2pa8mpu1u4r2kmphjk8b74/21431653833.pdfIn PDF document text
    • http://forti.in/userfiles/file/87779399073.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/betasobotarejugaw.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/2dd0197003673699abfd825d5a7761ad/31507799247.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/52399021809.pdfIn PDF document text
    • https://partnermind.cz/images/files/feraxazidijosase.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/587764167.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4af7e73acb---fageluravul.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/rabujusizajezom.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/kefekemimokawunopubaxez.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4022370bb0d9395843dba35856865a8c/68312230971.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/jenixoxobesusadek.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/55199418521.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/poxoxa.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/95294006854.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/80257237406.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/40f2be835bb6cbe487bf3d38754014a6/5443213441.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/79829035655.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/xejimumazubuwesip.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a91cb2535---13616372458.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/62c0b961ba45b014c4492a159cc9919e/zizonesufejelizoto.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/wuliditevibejup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=algebraic+expressions+grade+7+worksheets+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_off0000b149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 11348 bytes
SHA-256: c8052580da8e1f6c8079a231c9e9ae6f6ca21cce9a08b9fdb43e7d2191760c3f
font_02_sfnt_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 15740 bytes
SHA-256: dcb335607aeddda2efa4e0806f452ecd0c9357c8f3c9041c9816ddc226e6b6dc

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