Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28a51104d98e70b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 05:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11b9077724fb08c9ca5ccdcb673b157c SHA-1: a08b309e97ecf9747434122d25cb3d752900d003 SHA-256: b28a51104d98e70b98ab59aa5080088f668fda17a8ff2dc08207e3b5170b800a
236 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: User Execution T1566.001 Phishing: Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it contains a link farm hosted on compromised WordPress sites and lures the user into executing commands via the clipboard, consistent with social engineering attacks. The document body is unreadable, but the heuristics strongly suggest the intent is to trick the user into running a malicious command, likely leading to further payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5ad46546---9194018385.pdf In PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/jotugowimiwanupuw.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/16342663077.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/gejap.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/vosijejusiwanikip.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/28683903045.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaaec777a9---44326211495.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/k8951v8rdcajn9c92lsem6deq0/65640975931.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/datukogepomilepol.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/panogisa.pdfIn PDF document text
    • http://caramelitos.sk/files/kelebexewonajuremivepes.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/93835941623.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4a9c8c8caf7ff3e86e9e4b3fc0dfdcac/rovofuxilotolikanupe.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/vavowexofadovejivipi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9de8219dd---dofiwaxamufowuninudupo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b24b73320---39059462087.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ebb3ccba8020512b3cab8fbf9adf2891/47315697100.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e937dd13da---58640339621.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/66097273327.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/kododexesololan.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/wubafu.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/37021676432.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad9fdb4a2c---45245821371.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160944fa80de70---73378580104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=html+link+to+pdf+new+windowPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 18116 bytes
SHA-256: d8900fd0fc54de7898c6afa11f2899752c8f4f6f9784ff9d063e72b5fbd22c51
font_01_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 10396 bytes
SHA-256: 085e77a3c578552cebb77961959774b062fff4a016ca9e817250bb6d4c901150

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