Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d01f7e7909aa7e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-01 20:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5a20f884e7d6f24a5e811a38bedd1d5 SHA-1: c26d5aed04a22942e211936a4f84154e24aa0a4a SHA-256: 50d01f7e7909aa7e31df786e869512cb9176ef58d26138d04513bea2af22b4b7
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://drafthe.ru/uplcv?utm_term=it%27s+the+quarter+after+one PDF link annotation
    • http://esebtekstil.com/resimler/files/71146404044.pdfIn PDF document text
    • http://mp-journal.com/media/file/61767344879.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a20cfcb2231---laxonemabejijetit.pdfIn PDF document text
    • http://vizcsap.hu/files/file/53753545982.pdfIn PDF document text
    • http://coffee33.ru/archive/file/mexop.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/widoxata.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d7e0c95ab872a2bf946683a08132b368/4351847137.pdfIn PDF document text
    • http://artside.org/data/temp/file/58458359435.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612de2bbb4719---58478222906.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/jazegibekadutulezukuguwe.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/34441906400.pdfIn PDF document text
    • http://showdoimovel.com/files/files/68782959269.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/xosikiruna.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/14115272821.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/7ed6b42d7d40d66e105b8ccb4aa4254b/42579365459.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/nowijexovafuwemudovu.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/fekalutasi.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1d0c040e---47071391802.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a915584eea8---77760120868.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/44669564390.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/68329656610.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_off0000c208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC208 10404 bytes
SHA-256: bb87a0a9f09fd3639f93c4d2b39965801e7c19b21ddbe625659ad328354d8408
font_01_sfnt_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 19612 bytes
SHA-256: 11bc884e188db31a7adb8195b05117e6caab8d23056e22efb12198eb49f08ae1

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