Malicious PDF — malware analysis report

Static analysis result for SHA-256 2471d77f4556a120…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 13:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72857a10c1ed35f1d116eec2b13593c1 SHA-1: c8841e74cff674c9a88a3a246035d8de2e0c5965 SHA-256: 2471d77f4556a120824ebc31e443b760b997dcf75c5f50822880be150506cb32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn----0tbbbfo0f.xn--p1ai/userfiles/file/lefosonifanevejozoti.pdf In PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e215434c7---92520476295.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/japor.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/2531822956.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210912222339.pdfIn PDF document text
    • http://grupophi.es/uploads/files/fojomo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6f3d18868---funuru.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/vubofedevopemi.pdfIn PDF document text
    • http://minipit.com/data/files/vevime.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614044ff854f6---69420045984.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/83904731396.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/mizolonajunuvin.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/41331988131.pdfIn PDF document text
    • https://togeltop.net/contents/files/21173726738.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ccade6619e600f99ba25a1cf47b24040/tanokeligevudatowig.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/15302130482.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161411794a1478---82379756484.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/42083249888.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/84290227665.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/99914599853.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/6241657656142795a85b10.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/97155837839.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/tobizivasib.pdfIn PDF document text
    • https://proia.bg/userfiles/file/zegojopozota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+burnout+3+takedown+for+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_off0000c748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 17212 bytes
SHA-256: 87ace2d200b05bd4b48e6d72dc34691d619062ad90bfc060d6768a57945061fb
font_02_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 10772 bytes
SHA-256: 4fcdc79f2a3d6ce8e9c118939e3478003dd8ac4db87b24a0de7457f9914885eb

Open this report in the interactive analyzer, or submit your own file for analysis.