Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee5d602f26e527f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 03:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b54902f28ec3f511d9fcf940f6a3d9b2 SHA-1: 7268bbb3e60602fdb4c44d5e6ccf4f462a85da38 SHA-256: 5ee5d602f26e527f657a447b1f3c7ad63d90b900ccb50ae608ddf6638669a1f0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content or phishing sites. The presence of multiple external URIs and compromised CMS upload links strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079e47799d96---77997303754.pdf In PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a185762a1---xumataguwoguvozizijesape.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/fsu5prhc0sr64qcqo4tssjo7i6/30401311603.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zagufaxevezekotumarazeta.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/vunozi.pdfIn PDF document text
    • http://jew66.cn/fckimg/file/32377167928.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/towakoxijatuwibosazon.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/mexagilu.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/josafowago.pdfIn PDF document text
    • https://agatanorek.com/files/file/viziwowase.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/kaxumoposeravugolitedefur.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ba8418087---wesibagan.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/8638e756b3202056d190ad68b3e84399/dazuba.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/teziduropa.pdfIn PDF document text
    • http://i-dron.cz/data/file/pudebebapigusiniv.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/78815510286.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/tikisidapinosi.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/regejozefu.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/logebelon.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d22f98401f8---lurojitofavovemurawirosux.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/94939697145.pdfIn PDF document text
    • https://ferropula.hr/files/jirejadudi.pdfIn PDF document text
    • http://ridendo.cz/files/file/99971073437.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/ruwoma.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ca200367f6bad374ab11d5de175c4388/28290011682.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3d986fb64---68537158541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=caulk+over+grout+in+showerPDF 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_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 10764 bytes
SHA-256: 62f976c5a50c034a01e0cf402da90ad48140b3e45c0ecb927c143f7f325558ec
font_01_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 17536 bytes
SHA-256: 039bfb83ff325ee8d3ef170c60c8874bb508ef14a41b54f886ac54d9871db450
font_02_sfnt_off00012cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1