Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5e20067775b8bb…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 12:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1c6197b143f205e31b1c28861325581 SHA-1: 243b05be1be3252a637c4af1279168ecfb905024 SHA-256: 6d5e20067775b8bb48ac85384d69bce56ac070ccf793c5b038ea7fc8b9c46674
196 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm used for SEO poisoning or to host malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser update or extension. This is a common social engineering tactic to facilitate credential theft or malware installation. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kosagifuzatitadeludizax.pdf In PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/91526178992.pdfIn PDF document text
    • http://orlickachata.cz/files/files/79621854744.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/fojeperexusupugav.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/26158854995.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/63514521255.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/54065475106.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/voxamorasukexepazotunopu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/84af79b0c6621e8ddd735831935952b1/xogeginewaxazukubobuk.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/91457674181.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140c40ccce82---suzubuwibixamuf.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137baf8c898e---41423329894.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210901075316.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/41185353904.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/52555118995.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/82891591698.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/11765684634.pdfIn PDF document text
    • http://www.ezmoving.com/file/nawapisegalipuveponura.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408251b1698---sufixawopalisuxibevufovo.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/11039790096.pdfIn PDF document text
    • http://standdominica.org/files/files/xuzurixifukomafijaz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2g6t922j60jkvao7arhlerksh4/9295433698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=take+a+screenshot+on+this+devicePDF 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_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 10544 bytes
SHA-256: e1be43d201484fc6b87534cd370bab2a1275f93dd4b463c65954e872736453dc
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 19168 bytes
SHA-256: a9197481914bc8575731203b38cca8b65e6cc539463c01a9cac68fc2c79f3868

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