Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8298e06a18682f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-22 14:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17e79bda5de22e8e779e857f8878d453 SHA-1: 81a29559fba82453c5e36fa5fb39914ed0fcd413 SHA-256: bd8298e06a18682ff2cec72e228b68308f9ed5bf620e8006db464ec4639c66ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm heuristics point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://advantagelic.com/singhania/downloads/file/zibisirebowuna.pdf In PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/bawigesuriruwotun.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/juvemag.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/49579635240.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/1692631101.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/3746232799.pdfIn PDF document text
    • http://3sdent.com/upload/files/fusesurasuriw.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614241b431ae5---zotapomabilat.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/jujeluminifozanaj.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/40017187520.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/75547142107.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/55873468829.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/woxilubinejotu.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/47860543275.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/96971531694.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/1283791103.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///34001481035.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed38b67f53---38359357021.pdfIn PDF document text
    • http://hotechike.com/files/files/89840970693.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/99236874586.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/34447422152.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/jefem.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/lopigerinu.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/49893828563.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/43315144835.pdfIn PDF document text
    • https://fultoys.com/userfiles/vomupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+bluetooth+from+one+phone+to+anotherPDF 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_off0000c3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A0 16448 bytes
SHA-256: c59d30a7a97bd62284a9b8094ca2abded986ad6429271d17945f5454571a6aae
font_01_sfnt_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 10680 bytes
SHA-256: acc1a2f787462c34c6d7d3638637ec52c7edc8f6bc0cebbb3d6368093ccf449b