Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd875a90f1fc6f8…

MALICIOUS

PDF

78.4 KB Created: 2021-06-29 15:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ac679c35b209cd42c5586e9c13f88ec0 SHA-1: 7492d5d1f202833a0f5e6cc5ecf4f8c7a397fb1e SHA-256: dcd875a90f1fc6f8ab61e1b3ddc914b91171973d87541bc4826713c0c5c8e3a5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The presence of multiple external links and the nature of the hosting suggest an attempt to lure victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://aucoindeshalles.com/menu/file/wovuzukogurodefilalixudo.pdf In PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/p88g0cigu1vuig6qk2bovnv1o5/68998229449.pdfIn PDF document text
    • http://esistore.be/userfiles/file/83344252453.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5a29b4cf8f522f75760d44f3cd50f2cf/xibabivarorefeku.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a4aaa4396---jonibokisuwuzanudaxetud.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/19770229630.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe1cd3812f---vifavinobesaf.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/mebogurobujizese.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7a68948b0357c6e30d6b6ff489929028/58992972111.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/p74p8deurh92tlkj0tl5lclji6/18104677267.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a36eb136091---87433548041.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/17af68d615aede0189d1ea77681faeee/41811677591.pdfIn PDF document text
    • https://medtek.vn/storage/file/27452824277.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9af55c4b94d6adfcb236376f9249e327/jilulitedaje.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fbebb8577---12039362082.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48072c104f---baxavufesodozakukadatot.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/387e6e677e91583e7e19c17634542ad1/82356464736.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/wurufipuwo.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f6d40a64542904a8d5855b1df9eb0cd6/kubasiz.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9b83dd37d2b6b9062ba0289a4e965927/xaxub.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/f2bc43df626f29acb63709caf4508db4/54261412286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=comparative+and+superlative+adverbs+exercises+pdf+with+answersPDF 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_off0000cd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 17072 bytes
SHA-256: 385a0852088fb21a858429733bdc87e00257de7d9f3c34548846d562ae133ed5
font_02_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 11408 bytes
SHA-256: 1b66ca93f965793fbbb1c34ac49f8c8b0580fee68e53fedaf3b3c7cc053ba583

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