Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd1da2b71b6d342…

MALICIOUS

PDF

87.0 KB Created: 2021-07-07 23:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3c992aeb2286bcc8a3c72b9164fa71d SHA-1: b24e477c157d7119368656e8e98b8c1d55f85582 SHA-256: 1fd1da2b71b6d3422a8f14678313be9d14d5da515665f811c68208540cd4ae74
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with multiple URLs pointing to PDF files within plugin upload directories. This suggests an attempt to lure users to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/375c1d4cd5de4cdac4abdfcc4c222830/90148484441.pdf In PDF document text
    • http://xboxheerlen.nl/userfiles/file/38676132838.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/menagomaben.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d9edb71618e5e861c521f3cb52befcb8/93872734620.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092238f1712f---87029994458.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/rurujofubu.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/95a1d8c022ca8c3e5fd628a4ddecb526/resebidokunanoxogilo.pdfIn PDF document text
    • https://ksuskalology.com/images/file/54305475505.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4926db00be---pubejinebatomaxe.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aff40d806---safeje.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160898328daaf7---todikosowop.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609358a167bc1---tatip.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072556493a8f---22759978241.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/26208170142.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a380572f66---gorewibinik.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a818b37bc0---xekudafurevimirivana.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608af14017bdb---koxejiz.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/51eb46e39ae6970654e0dd7c9b7e9840/34695517248.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/9847c3f06c505068279008e7cb68f6f5/komalaruxurofawomivu.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/7252852660.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/46425833827.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/fda68f16000afe7223e8a4191b18d415/faraxejubi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67d29e79b3---sosujawurolobegefitivus.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/e51ae30c31dbacc00b0fcbe949acb4c0/tonemukitojalo.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/56860978644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=graphing+periodic+trends+activity+answer+keyPDF 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_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 11144 bytes
SHA-256: 972845cf6ff7e9ea2cfaae3736964c185cf72bf30466dfd5c593a34af070ab70
font_01_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 17508 bytes
SHA-256: a3ba674741c6034ee0f03c518bca3bede68451c26521e800725489bbda91558e
font_02_sfnt_off0001364a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.