Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d904fd9997e458…

MALICIOUS

PDF

77.9 KB Created: 2021-09-04 16:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1da278f4b165ce9a6f6c0169a4f78247 SHA-1: 70cc0384a0a54b5d42c134b03eeec200a151b967 SHA-256: 30d904fd9997e4583e9947faffb6230cabc1262f926db9c913bec5cb7a12ce29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents. The presence of 'utm_term' parameters suggests a tracking or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://nomylo.ru/uplcv?utm_term=golongan+obat+antasida+pdf PDF link annotation
    • http://gsmontaggi.it/userfiles/files/pusadukifenozafe.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cf03c3efa---gaxekobatuju.pdfIn PDF document text
    • http://www.ezmoving.com/file/nuzasizedug.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/98014671991.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/17260965524.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///nipirozitotiwizerugusiba.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/83760014505.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/jikatifekubimidirexukanog.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/78106283557.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/lakobu.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/revivumuwatop.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/32679392441.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/4499350644.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/wozodisudumukezaxasutaz.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837fbcb5354---bikana.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210709154842.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/fevokegeparo.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210525094304.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/kunetovodojewe.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47facedfe---nokiraraworenefu.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/42592647652.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_off0000d0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 10620 bytes
SHA-256: b06a493a59ba3b58cd47a9b9c415fe2150d4e5e557823b6297e4e1d3056e6442
font_02_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 16008 bytes
SHA-256: 4a4289025cec2fe252abad715865c229da0df4d90b672624c193fbc6c1c93d99