Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03a3ef39409c533…

MALICIOUS

PDF

78.7 KB Created: 2021-07-02 20:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5b857f04457abc46a87d9210f2753d16 SHA-1: 4e39ef018f477f1c79c4248b5879a694544f0aca SHA-256: e03a3ef39409c5339554a0dbdef0aa36a4e24a826458d4418a7258d010eda2f4
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host further PDF files. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086fde6c17be---254365631.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/n4lejnkdcb2jl6150463n4eot3/naviponuxe.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b76282e3---futufalakewigunititoja.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/kcbobd1evsqesdqmqspl4f7gi0/mubemoratotawefej.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/nodosuzed.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa67780ef9---bilomonejilezikobefukatu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/libhb879f4auth11ag8k5igrna/24092381377.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/minewozizajogubek.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/25634525064.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/85573024204.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/74397738772.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/1fa02a9a2fa49c62e1b8cb06dfa164ab/venimujoregixigezubapini.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4cd5770c431b4a15ebc14102b5a9ddf7/25667888016.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/74591291856.pdfIn PDF document text
    • http://abpaluso.com/upload/file/11432187280.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210612104347.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1f219bce2---viseserolagape.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/93661083144.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/36418343470.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/patasafamafujudetimapobu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e4f4f05066c6b383825c3fb9990c83f1/23558924572.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zebexigiz.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/bbce7ac6fd2fdc14565e7a5d1bfed5bf/mifitevesamemuxamuto.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c9345c209ea---76952997421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=design+and+operation+of+farm+irrigation+systemsPDF 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_off0000cf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF35 16560 bytes
SHA-256: 89f1071530b96682de2ec7896828adfea03dee6c1ee93e1a3ee10021d23637c4
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 10908 bytes
SHA-256: 8187a5746c0ed09cd6eb524916a06c4dda3ab32247a57151fd315ff870e96a3f
font_02_sfnt_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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