Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbfd8ff9b16bcb4…

MALICIOUS

PDF

92.1 KB Created: 2021-09-12 07:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0379761080a12b90f1e5d1c78b1df36e SHA-1: 0fb640d773431c3c7225345b71f5fe82fc971671 SHA-256: 9dbfd8ff9b16bcb4d7906a41bb53d3f4c610d7634ee6feb97a2e62797b532ef9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://siamsnail.com/media/userfiles/files/24952802105.pdf In PDF document text
    • http://apsencollege.org/test/fckeditor/file/4778636436.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/godufedewakipuf.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/88978335558.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/45495384652.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/kovidowaberolez.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613881c03be9c---gerasujozubowosajuxovad.pdfIn PDF document text
    • http://showdoimovel.com/files/files/butodojulo.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/wematotenudemurepof.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/16681260552.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/eda1d7653708832fb5cf1804ad586741/55798766360.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/lisabakapifa.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/gedogijabazid.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/vololunomojepumu.pdfIn PDF document text
    • https://khanikango.in/file/41134452671.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/fiwizogarikurume.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/27485190857.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/zigubikefiziv.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/wawokijunute.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/xobitidotufopadovoko.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/i0ifdds0tl0d4p12kg4e417ik4/41080308457.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/74459391048.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/65299022109.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/61030365874.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/rotolonanozibujumik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=siddhartha+pdf+espa%C3%B1olPDF 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_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 19980 bytes
SHA-256: 7e9310284917f1fc20f81860ce25ee192d26b32368458b65930eb0e6a004285f
font_01_sfnt_off000130c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C7 10772 bytes
SHA-256: b842162df4352a9f331fbaec1b9ae6c88ddd988871274a26867f6055ff1d5c08
font_02_sfnt_off00014975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1