Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e83eec316d146c…

MALICIOUS

PDF

79.4 KB Created: 2021-08-14 17:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f02d2f448be9c8479b43f85e4de0266 SHA-1: a594a1ed2127bfbe64deab3c0f3f3f7ee7111296 SHA-256: d4e83eec316d146c36061c9ba4b965a6e4ff63140014a43f491b00f9f34e8fa4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, presenting numerous URLs hosted on compromised or disposable domains, likely to trick users into downloading a malicious payload disguised as practice tests. The presence of embedded JavaScript, though not directly analyzed for specific actions, suggests a mechanism for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://meechoktoolmart.com/user_img/files/xukejin.pdf In PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c052b3bbf---65731938231.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/53772816618.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e3d76a99dfe39726fa88527f76200803/40524464041.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/24821506102.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c9be417ffd8e8fa3ae765ed7a4c1da9e/luwevumuzupabufawafo.pdfIn PDF document text
    • http://inistor.com/ufiles/files/vokexezokewifigubiligel.pdfIn PDF document text
    • http://venturahigh1967.com/clients/40640/File/59204821307.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/86159950806.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160886c0265bec---62735895071.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/81110561902.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/46639068206.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/foxobob.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a19af5f1a5d---96956356371.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/075639d43a8808f898bc54d223defadf/dinepevotexizodi.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/zedebisa.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae8c4a15e---sipelokajuxenanakepud.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/4119571434.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/66ed6bc74df6d64780f07ce105d9d4f9/35142705041.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/84482342831.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c62b8c960ba---21350408000.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/47894915884.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607147b225793---23864719444.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b015c1bf21---90883899291.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/53068851278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=successful+10+fce+practice+tests+new+2015+format+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_off0000c420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC420 21944 bytes
SHA-256: 8786ece808817b7ff521dd8a5a142e521fba2d57406ca22a847253b92dcc914d
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 11468 bytes
SHA-256: a3a0dd226ab75926d809a9c031b82cee3380e8c4320b93e64a2c6851c5d97d69

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