Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f737877d2e72c3a…

MALICIOUS

PDF

98.2 KB Created: 2021-09-07 09:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aed6a93b891c19ac63c1cedb11d97e9a SHA-1: 61159373ded13e949a321a00723061c2a5435de9 SHA-256: 5f737877d2e72c3ad1013bcb4f9b6d5a378779e6b3466a47730a136cade0a992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and links to potentially compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=panlapi+at+salitang+ugat+worksheet+pdf PDF link annotation
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c766dfa7f366f8d4a349964a6973876/dasonabosoxezokekiximito.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4903745460de1e9bcb93a.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d7924bf48b4a5e59702f9b9ced6b8f20/15148687165.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/wividozomedujesurodapoxez.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/86554028247.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8t03k9f3se2o2th3ueobiacarv/37814115993.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/47448138441.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/20326752546.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985f1ad0d00---matopedavobokedami.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/dc9753b642b2cb58546e3483c4572d77/2268070343.pdfIn PDF document text
    • http://ruihuitax.com/files/file/58871089593.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/93739024264.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/57995989228.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c535801ae7c---pabasasabewon.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/mojatofagoguzupuwik.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/ginukuwujoluwiraxedu.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-20/20210520235239911485.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607141b5ee591---xozibam.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd1c96391---mafuxof.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8f5b91dea---45042061748.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d306ae5d1d941433c7c5adeeca9129c8/82650342878.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/25fba7ea03481835288d5cbdd4513b88/68900658968.pdfIn PDF document text
    • https://ntc-container.com/upload/files/xezugigekelamavofivemuxuk.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210713/16261258968047.pdfIn PDF document text
    • 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_off000118e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E1 11056 bytes
SHA-256: 2d88f9c323728fce62d774a44ae684b766eeeaf47c0448f0bd912cf4af31bb00
font_01_sfnt_off0001326f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326F 18756 bytes
SHA-256: 541cc53c820ffd954453467182886fe924dc3cc430b4aada64289cb6a6b05ef5
font_02_sfnt_off000162f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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