Malicious PDF — malware analysis report

Static analysis result for SHA-256 41017ef346fe2221…

MALICIOUS

PDF

101.1 KB Created: 2021-07-31 06:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1cbe4be2c8f2577f58e6e2ecefc10d1a SHA-1: 0969983d482997a26fe347c3baeff62fb904a14a SHA-256: 41017ef346fe2221494d8293b4b8c0aa38c9fa91e9da175c08f7cea124457d1b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/93c60bb0d8fd6f2c73c98e5a6b988404/rolapel.pdf In PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/r9uoo06ljttcrp39rq6b0oae13/54817684475.pdfIn PDF document text
    • http://huntland.hu/upload/file/tijakixonovomazajelex.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/82409809822.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098f9e878769---radefosalurasug.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/a982770cc84e1ec0f2b595070b8ba9a0/devuditujaxarikelufamasi.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/42257975705.pdfIn PDF document text
    • http://lblussana.it/images/file/rupamagewogubomozupos.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5988e40578---63450964675.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/37509559282.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d00bc4e7c---zagawoxixu.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/32313850717.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210729225729777767tp717.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb5007e83---vakunuzematu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/finozenutitumosoxe.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/0pq70jjag2g8g4mvhqhc9jim62/28924536114.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160818d2ad713c---48308276116.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gilegoratagak.pdfIn PDF document text
    • https://anakmeong.com/contents//files/ruvojufepiwifasuwutanugi.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/23788821255.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vlq092e8r3autsp6b4a6qbhgcg/58885988786.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05fa1c4860---1629559171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=reported+speech+dialogue+exercises+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 17468 bytes
SHA-256: cd48c9dd248660bb7479925ddbad421849af0f3ffd16848da2bca1399628177c
font_01_sfnt_off00013247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13247 20756 bytes
SHA-256: 5931bf2b7a55c9032c54eefde5c0f665f0ef376faeea6ae41133b070497de980
font_02_sfnt_off0001542e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1542E 11040 bytes
SHA-256: 611071ff3577a44aaa04ad19917bff161ccf2a4c2593e78365e7e8e7b1080d2b
font_03_sfnt_off00016ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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