Malicious PDF — malware analysis report

Static analysis result for SHA-256 f778a81d0a35a9d2…

MALICIOUS

PDF

88.6 KB Created: 2021-09-09 06:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c992e285537055cc68043593f23c4d6 SHA-1: 86cf5f2423a48152e65e6aab631a66a3cb545b41 SHA-256: f778a81d0a35a9d22b2f162113cb58176d5c55bb25a9370c9c0eb76ca3d57450
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the heuristic firings point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://uleshuzatshop.hu/files/file/71531674501.pdf In PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/woror.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f0209fdcf---kulajuxedefibirino.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/zeduvesodimek.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/19703879521.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/98731750772.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/somafibojomatinejaxusos.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396c5fc03cd---13431938504.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210904012700.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/xuxadixu.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/32379925784.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/263d5b2ed5bc9af16025ee9c6917fa8a/jevuw.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613951f7cbc9b---gagagafopor.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109031532224528.pdfIn PDF document text
    • https://matrixx.lu/images/70019921547.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/novanazadebubivon.pdfIn PDF document text
    • http://rsentco.com/upload/file/ramuronafubutoripoz.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5f764349rm6oa9dsqh3sdejes4/30714995347.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/zupixaxox.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/nigiguziki.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/zokawubigimek.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/35547102220.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/gobajumodedaxabetela.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/dofubovunewi.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/poguxuzanuvosuzagak.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/50854909242.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/zesuxedokatojubovajopemes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+summoner+games+androidPDF 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_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 10696 bytes
SHA-256: 75a2e662758cc1878fa409da27ed48afc638f7b2b7fcea11c3f4ccabf6474933
font_01_sfnt_off00011036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 17172 bytes
SHA-256: 924899dd0d30fa6eb03b676f892433ee87bd9c403e0f780209bcb7fa9800a923
font_02_sfnt_off00013c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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