Malicious PDF — malware analysis report

Static analysis result for SHA-256 45958fc28896e8f5…

MALICIOUS

PDF

79.2 KB Created: 2021-08-19 23:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e29b2f241e1398afa83c4fe75aeea572 SHA-1: 097770941921af65039baefd804a066a126169cc SHA-256: 45958fc28896e8f56e387d96c5a1ce47dbdd5497fe538e30bf3df7b6b0a31970
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://smidgel.ru/uplcv?utm_term=descargar+neo+geo+cup+98+android PDF link annotation
    • https://quangcaowebsite.vn/uploads/files/83882856942.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/53385215064.pdfIn PDF document text
    • http://samtle.net/ckupload/files/89405021642.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5i24qiigc81rnmv1m7ql43ss6a/73447048307.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/tavor.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745285dec87---29006375013.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/28441367612.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/acq4u41nuo0mhq4b0dfp8730sh/28596935691.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/fasidezifezalidonulokixom.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2cfbd5851b7470c423c48e9c9a2a7db9/27582400129.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608545242b018---94511724013.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/29411548000.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/tutidegub.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/68993688394.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/71308c05a2e63c2a93f2554d3f81db01/2569760717.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1e93811d---93868939268.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec04ca7c9---18725910215.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/tobelepofekivadatimerutuw.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/xumibadoxagifajo.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/39627089844.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/43938309900.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d6c87d0e0d7ab819398d4addfaec8b94/sejokoleb.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/68693202343.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/xosixikajusagukulajaxuwa.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zuvasedewofane.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8a128ccfc---82121217901.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_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 17320 bytes
SHA-256: 6f9d4e13b39ad75ea3aef9bf2acc7790a69e46b3d6cca12cb0d9200361a56236
font_01_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 11020 bytes
SHA-256: f642b7e6c49d4d657ca60e8205c9398a97aebc325d9ac31291b72a730f3e0c75
font_02_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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