Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd4eef76107b3f2…

MALICIOUS

PDF

77.2 KB Created: 2021-09-13 20:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1f7f08c4479e862ab59b272d227c040 SHA-1: 76d0b521c31e453134e931205847885d50639b70 SHA-256: 4bd4eef76107b3f283496a08cd4d93b9f0993e810f43ada16ce08d640cf48b88
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://synerhu.ru/uplcv?utm_term=msi+windpad+110w+android PDF link annotation
    • http://muntepa.com/userfiles/files/63180148675.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/wolopuwuduloj.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/37589698456.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202197163696159.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f08247e75---69835335617.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/sogelebakibi.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/filot.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/89913550012.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/45570852597.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2cd891446---sigisilodazavogoji.pdfIn PDF document text
    • http://didula.com/img/file/59076517126.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/38388425434.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/15361007169.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/rezubajekew.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/uueugg5n7tks5lqml9v8oesuqr/mediworanabiwisaziri.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/xazevusadosub.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/84445047338.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/fanepemuruduxabeg.pdfIn PDF document text
    • http://etre-belle.su/images/file/27520243763.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/9387865465.pdfIn PDF document text
    • https://jss-moms.si/upload/File/lovazemogixodiribuzov.pdfIn PDF document text
    • 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_off0000bf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF48 21312 bytes
SHA-256: 62d1508f812f8d41bef46139a1c3274b47a5aecf12c494b385273a9c5d5dbb93
font_01_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 10364 bytes
SHA-256: ce4a8a8e9c4307a219f055a572fca935a0912485cb819160ceabcec62e8774f0
font_02_sfnt_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1