Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff112f46d2bc504f…

MALICIOUS

PDF

68.9 KB Created: 2021-09-19 06:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fbccbb5b417f329b7fd025e0564b0ff6 SHA-1: 023103a2294cb184e5fbbe080c92681f6a801023 SHA-256: ff112f46d2bc504f24020c2eb01b34578d9990997388f4fa9cc31e3a7ebcbcd5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many pointing to domains identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://spamsmsgiare.com/media/ftp/file/98532021980.pdf In PDF document text
    • https://dolupin.com/calisma2/files/uploads/givexobaduzuwe.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210915140225_1398553757.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/15180506921.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/ziwijuwesetofapi.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/fuxifokeduwupasum.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210904073807.pdfIn PDF document text
    • http://ijfbn.com/editor_up/15846972624.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/39793655570.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/79b9bece599d7abf3d5d845426fb01c3/banukijifuvurumowunirim.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/wunoxuritufirozosojoliw.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/59986497887.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/30942379409.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/kerifedamowebawopirilex.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/faxuv.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b9a94bf8---zuvolapivojesudumizo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e5f0adc6101fc2201beb40e81422a58/dagipajiguzexarovudemer.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/varerimexisivusa.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/75786959766.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210910023052.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/97364135951.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/74470929017.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/vemifuwarezivinevusegap.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/kiwivafomixetulejubipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=classic+arcade+games+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_off0000b0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 10752 bytes
SHA-256: 50e40bfc0240e3dc2615042fffb9f3d70f4cda838c8db0cf596b2a7a9f037d5a
font_02_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 14640 bytes
SHA-256: 4964844532a924e22cb1f95b36832cb54f4087c98829145b7ae0ccd6d359fe52