Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d906b94bf4cfc2b…

MALICIOUS

PDF

92.9 KB Created: 2021-06-30 01:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 669a3a506d887de7ab2b628bf49ffe98 SHA-1: ef0ec5b0697b6ca96f40bd2f008c608b2352dfb9 SHA-256: 0d906b94bf4cfc2b7572e69e6a85ed12516b207bfaee64444a6380b8222d783d
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious. The presence of these links indicates an attempt to direct users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 5

  • 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=expedited+order+meaning PDF link annotation
    • https://celebicatering.com/upload/ckfinder/files/lilinevoti.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/zevexazijewos.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90406493086.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6ecea0363---57212176756.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/28571881402.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vudimetorev.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/bedusilemivewuze.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/66363377349.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/262043218886.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e31bea12cb835098f4a5ccf80931207f/zugogibunejuzojilimis.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/nobomulojelideju.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0f87ceb01---viposedagixe.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608751756a0b5---24410018048.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/zutobofamesaregosakudoj.pdfIn PDF document text
    • http://fittbike.hu/files/file/27447831246.pdfIn PDF document text
    • https://airbays.com/userfiles/file/zixodatapibomomegaj.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a222d403f624bdce43e8a1e498cf9a03/54606080624.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/179633cf661a1cc9c2b95d62bbc0bef7/jesiwopa.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/74183546692.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28702706dd---88181500789.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/ludoxitukexinigabe.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077962288902---72099939259.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a11ccdc8e---lujebomitas.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761230e4328---11295357887.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/niwasupexaw.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608987571ad62---relav.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_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 17824 bytes
SHA-256: 58e7102b19ca63b986bf28a41bc761d02c28b004964ff60704f51513193995c4
font_01_sfnt_off0001366a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E81 10604 bytes
SHA-256: dbf22d945977aee234eb87b817b6879759e6ae100936e862322e816b9927c781