Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe54cb27730674a2…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 01:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d7ff65c985289fdbb1ffed8688118274 SHA-1: 59cc52a6733be6d1f86625f58928adce071bf1e6 SHA-256: fe54cb27730674a2a7d281e7f8a25dbe02e4691806c5eae6b8e18ed5f477f06a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://chcial.ru/uplcv?utm_term=libro+de+formacion+civica+y+etica+1+grado+primaria+pdf PDF link annotation
    • https://vieclamxaydung24h.com/upload/files/92757734827.pdfIn PDF document text
    • https://fptica.ru/images/file/sekaxifulogalufavim.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f6160968---27780497735.pdfIn PDF document text
    • http://www.520amis.com/upload/files/pexapewul.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/sopodu.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210707_844346E3BD1136F6.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaba221859---58790505650.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f67044a16---48468093378.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/scudqr8f687i5inf238anta6pn/vojusekojojudugura.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/vunanubowopajoxejoxaj.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/gikipojemonazokukepa.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/fffcba4e2f3a0e412bc6fe658b819864/zutapikelamoboxobukusexe.pdfIn PDF document text
    • https://eurotig.ro/file/54496074513.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/64203701664.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ce692613dc9---85542252038.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16106813ea7727---65451136349.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/47706423659.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/75790394655.pdfIn PDF document text
    • https://digiconelectronics.com/media/zasoroxi.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161125aa109926---sodudokexonowowibasup.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/57500887572.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/8641485158.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/48512034854.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f89c85be41f---715141961.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16111db9b7830f---24467920858.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_off0000c5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F8 11080 bytes
SHA-256: 0486c8d141296ad325063c262284896c27ce04274ded81ca0742f6fce4dd03f7
font_01_sfnt_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 19016 bytes
SHA-256: cb13d94bde41d46102494b437ae365b20791a593645e81349601b90b4fd33de5

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