Malicious PDF — malware analysis report

Static analysis result for SHA-256 a225880c8b49f165…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 15:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c513ff30f93034afae9669ef9e29f9c2 SHA-1: dd58e018965cdfd2cd6b4037c628e35110566dff SHA-256: a225880c8b49f16562696a4ede14b2e14c08d289c249e3f6c1feec197e40ca2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI indicators and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=the+simpsons+season+1+episode+1 PDF link annotation
    • http://ydchem.cn/filespath/files/20210925071821.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/wovoweruletizumiporu.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/34657205660.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/kfuko3dj0a31r8f88j14d30foe/80521925775.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/83389507450.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/kuvikijeropom.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/20171792940.pdfIn PDF document text
    • http://jawarakreasi.com/file/derataberoxugowerimit.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/39069115935.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/38132420369.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/98020705638.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/tudejidugebigadugijiz.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f45f3c3bc---zujagazofonuj.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c51257c0---42077497315.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/vuvufokep.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/40480095869.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/22216012297.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jinulatopupixelalakunu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af15610ebb---labewefojatogelil.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/lebozetudexuj.pdfIn PDF document text
    • https://mapithanhcong.com/upload/ck/files/latobenusebapeg.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/pexesibadegedudikogobono.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/42924670439.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/fogikefaniduvezivopisoja.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_off0000b03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03C 15628 bytes
SHA-256: e8bce2a477a3ae262c2c838672aeb0554485d65dc3cbe36980901ab74519a8fd
font_01_sfnt_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 10428 bytes
SHA-256: e16e5b2526632b02234c330e83861461ff031a44f572f56a32c2b4f89f99bd52
font_02_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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