Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87bb582da23ca30…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 13:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6fa3f8417c1d45d58ad5fce723b0732 SHA-1: 38b9e73981146715977a6b963039ef5111e51fd6 SHA-256: e87bb582da23ca30621646112613c290e0d1a445c4e0b0f37d6e05c7066cfcd8
156 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous links and the use of compromised sites align with techniques to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.hkha.com.hk/ckfinder/userfiles/files/64320192536.pdf In PDF document text
    • http://derp74.fooden.com/UserFiles/files/63296550639.pdfIn PDF document text
    • http://mextro.de/upload/files/90606380728.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/24078732604.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/subojokekefafole.pdfIn PDF document text
    • http://dd-eng.com/files/files/vugivafetuz.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6141ffde4dc1d.pdfIn PDF document text
    • http://learningkey.org/userfiles/1645215890.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/jorotifulop.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee40a95ec---73618944613.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325f6ff1ab1---58305001036.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/vatenelemizuz.pdfIn PDF document text
    • https://kueapem.com/contents/files/webelaxesis.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/nakojusujapipimiponoba.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/sijokorofegijatitu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b756b174---popepomikinanu.pdfIn PDF document text
    • http://zerosquareonline.com/file/goroluwunakata.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/jazujunigi.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/ziwux.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/35152862126.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/jajisovefizoxijodu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb65594776---48956120384.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/38433610122.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161355b115406f---82162616212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+adjust+push+notifications+on+androidPDF 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_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 10848 bytes
SHA-256: e5b9df9d9cfd9f6d5743ba4d30aeace6d347e09d015f84d022694ed81598310f
font_01_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 17348 bytes
SHA-256: 3240825e0d5e78c3522a2fb745adb666549f1c7e7d96f56e351c3eb46760cacf
font_02_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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