Malicious PDF — malware analysis report

Static analysis result for SHA-256 4957d3098ddc996a…

MALICIOUS

PDF

78.9 KB Created: 2021-08-31 02:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3ba495697011176fe69a912c5bd2a65 SHA-1: 3c4f8f260efd423ccfd0b7284277cef351e1fa84 SHA-256: 4957d3098ddc996ae6d6c89a8f5011b8c22eb20e21144d75d4b3226d36b5ae29
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure itself is indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://yilip.net/userData/board/file/92446189036.pdf In PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/dawizivowuwegi.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210815164526.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/bfe808ca0d8b796d211b1dbf4cf63300/salelolimotuxaj.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4362984a0---97748267430.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b0f328cc2aae88241bed796a24ac476c/nexefiramoruposinogipov.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b615aa9bc7e---2740409642.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/libujurojatonamelojogotop.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/gezugefawofiwa.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa28a1d62---gigaxafilewub.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/97062810467.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/sebowanagikawesuwokebupul.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/50089263274.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/monelajuniwejab.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/16273236455.pdfIn PDF document text
    • http://elskenecologie.nl/files/tetigorupusiguk.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/67837878580.pdfIn PDF document text
    • https://fratellifurloni.it/file/demiserarafar.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/22803068716.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/58170f8a9108bc5970af494b5a512e11/jewewisufitexozuridosefuk.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/97504170381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=horse+racing+track+conditions+explainedPDF link annotation
    • 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_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 17088 bytes
SHA-256: 98fc9a85c3b7db026a4ed688c1d205a4d62843d77cbde4f75d5d91893dbdc313
font_01_sfnt_off0000fd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD14 10876 bytes
SHA-256: f20075986bede3b9f095cd077132da80cc3fb62ec049d8d50ee376054f2aae8d
font_02_sfnt_off0001161a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1