Malicious PDF — malware analysis report

Static analysis result for SHA-256 d992c04529ffa23b…

MALICIOUS

PDF

123.7 KB Created: 2021-07-25 23:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 648dfd117b7a3997a11a28d3ef240355 SHA-1: 7a44e69ab241634b42886d0259a7e9357f66fe7a SHA-256: d992c04529ffa23baf35a03b4888e481c2c3cf035f5bbd1af02418c2aec4e8f2
172 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to various domains, many of which appear to be compromised or disposable hosting. The presence of 'pte academic practice test plus - volume 1 pdf' in a URL suggests a lure to download educational material, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://4bx.pl/public/file/gafewelulanasawobiro.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c69637469---vamejefogaxovewo.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/714af6b826bc496ddff37f721420a28e/22750596040.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbc470b53---93978873422.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/zirivasen.pdfIn PDF document text
    • http://blueyee.com/upload/file/211712509156.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/8595152870.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/227d18fbcb09e72c69c92d56c456fb57/suvujiv.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/583e0574e8fabd84af8e2c7e72e8596e/fuvetebavimavasoremapoxe.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/juwijokiwewefeku.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad39b87574---63616727903.pdfIn PDF document text
    • http://wawa757.com/uploads/files/jojusoburikanekigabikibo.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798f4cb0bfd---xutiwikugizamos.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/075f0520ed86f37be87d7a375c56851d/jusomoxotowoxu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/vikiju.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/ca8a6d36026cde0b14bd9c8ebcc283f0/dininugelijinesakiz.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/72e69091f482a90594b6ecad2cbde0e3/domanubixibekozeru.pdfIn PDF document text
    • http://teraval.cz/res/file/vubojas.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/27589136333.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c66aae9913---92481429994.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ko1ngsm45bnl3ef54dg5fg056p/57688155091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pte+academic+practice+test+plus+-+volume+1+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_off000180da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000198ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198EC 17772 bytes
SHA-256: 8325abdc15ade07182edacff5f55b00a784bf53fa30bcf35d60ae1c756b50efe
font_02_sfnt_off0001c746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C746 10932 bytes
SHA-256: d2c7702dd71cd34ef87094eda19244b68e71b2dd45bf847ed09b474f09bbcfde

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