Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce186f9dedc1ad7…

MALICIOUS

PDF

73.0 KB Created: 2021-09-23 02:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a4b69ac08c10c5f96b9a860a8a1c141 SHA-1: 16bec51d2ca41d2bfaaa8b736a998db494f63933 SHA-256: dce186f9dedc1ad7b1843dcee8758d0c525e204861831bc9676da89f48fde8d5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links pointing to external resources, with several heuristics indicating these are part of a link farm on compromised or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading further malware. The presence of numerous PDF_URI and PDF_RANDOM_URL_LINK heuristics reinforces this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://timavoshipsupply.it/userfiles/file/bupukojewirigelajij.pdf In PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/kewoxezekalas.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/bajufagukaxumibaxe.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161430c9217471---valofixuzif.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/48497816890.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/79644416626.pdfIn PDF document text
    • https://servauto.fr/img/user/file/livabo.pdfIn PDF document text
    • https://dukupahit.com/contents/files/8253413142.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/xofudugiwisemufopinizub.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613225646a3b9---14269317564.pdfIn PDF document text
    • http://talesma.com/E/file/kitiladisabitufifi.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/25922132325.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/24559818887.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/26878137930.pdfIn PDF document text
    • https://samowar.ch/upload/file/tubas.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/sulolosasuz.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/piguvutuxinugafe.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/tafetadoxagu.pdfIn PDF document text
    • https://alutat.com/data/file/bamujazuzerijekaxadolupu.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/2257007328.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/womeduvawuvub.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161387bc5e47ed---43633452268.pdfIn PDF document text
    • https://tarsiman.ee/files/file/vafevegafomatofuzevosujiv.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/mulitedidofuxofepogeruros.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/vujikifosukobofikox.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/97247711186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=afk+eternals+apkPDF 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_off0000b854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB854 18296 bytes
SHA-256: 1a1706b22c08f1cec44f21f95e4a7c3d0dd0fc35394bac73621cd2444edb2694
font_01_sfnt_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 10212 bytes
SHA-256: b7e32b2463f5f79efa597be4052315c0565888840252d6e25d73d3d482f28650

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