Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e95c3cd9f97bcc…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 21:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a953d6464ed9be21aeac8aebe17b823 SHA-1: 9587f5ba90a8ad8f2e48ae471be6900cbb713f3e SHA-256: 53e95c3cd9f97bcca92a2b6d36647c0044f2a082f4a08cd083d7d316366e3cc3
176 Risk Score

Malware Insights

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

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the overall structure and URL distribution suggest a phishing campaign aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://inwebjor.ru/uplcv?utm_term=adobe+editable+pdf+free+download PDF link annotation
    • http://zhxndl.com/uploadfiles/files/mikop.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/lizusujiwat.pdfIn PDF document text
    • https://elektrona.cz/files/file/82765202110.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0462bd8bd---32869375077.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/wakafigi.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/2148916266.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/meparoduluk.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/loziwajo.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c92237a658b---vuzufuximoxakakutigawaz.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/bilimosudakijijek.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/68580226347.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/duwiwu.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/zinev.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ttmfr9oo19v66at5ck4tbl4314/16730281914.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/jufomazaj.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/9a2ce5abfafeb552df43cf60dc704a5a/serozorosatabosag.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/xefemininowifudomu.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/54612081671.pdfIn PDF document text
    • http://dentherapia.hu/files/file/weromulejupolawipu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612b812c38328---lusutefudomesoxenisuxise.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/1691583495.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/7524222217.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/vunumelifemo.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/46184271410.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c19a5620a---55523465971.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_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001015d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 18976 bytes
SHA-256: 480f94d352bf88eb7f7986eab4deb4fda5c9a3632f06db8dab89cc49f6e668bb
font_02_sfnt_off000131f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 10532 bytes
SHA-256: 42298aa43e23a4376224d6a0cc69091767b9517873e0078913546bfd272ed75a

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