Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d60f99ff1de30c9…

MALICIOUS

PDF

90.7 KB Created: 2021-08-14 18:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 24024c0db4bda16d01f2b95ee6c38ae8 SHA-1: d283c33eb34e6e79877642aab130d2096f010e8b SHA-256: 3d60f99ff1de30c92ecc40a54f5e0ee384d556fbdd541f5212f03739cc39860a
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=motu+patlu+cartoon+video+full+episode PDF link annotation
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160928bdfa12e3---80331140309.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0c18adb4dc6fd89a892ad3821a270ed/ravavegof.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608472f61eead---90259189956.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/bijamenasadeviwonifejip.pdfIn PDF document text
    • https://ms01bet.com/contents//files/90462294343.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3256ee401554f3599f3bfbdb096fda28/69054229773.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16100cb51def3c---41971275486.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/moveniw.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b891c451920---50246198195.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b05b7bd18---dalej.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bddc3e632---mozebemur.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/22836580989.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089044d83b1d---jisupej.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/derulo.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/rurek.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/733ors2fu03kk17s0trqd149i4/forofarap.pdfIn PDF document text
    • http://edgecs.net/documents/73610611991.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8febb198---siraxigujepadudagezazu.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/32632318088.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210705_210819.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/xuvefovosuvowapogawuvazud.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/96232228199.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/voripomive.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e46b376c8---fovuno.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_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 17984 bytes
SHA-256: c9f22d4e59aba399d8679de8a548e117dd4c2a8c84e77c1636cae4fcf59ad4a9
font_01_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001442a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442A 10772 bytes
SHA-256: 92a5c21baa62bcda2be289629ad3e71fffacd43520f78010b6e99db35b9b38b7

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