Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3390ebdb5e3865…

MALICIOUS

PDF

104.4 KB Created: 2021-09-04 02:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4bb7cb8fa4aa86b532e2ebfa4eb31bbe SHA-1: 5c6e88e30c6a904b7ba9f51af0f9ffbed35bb468 SHA-256: 5c3390ebdb5e38651c80327673cd807d896c80632e02953860521672fd0d220e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/vanes.pdf In PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/f22e426c66fe06cfe57b28d33a5dd8ea/6925630930.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/kamikevur.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/21106951610f322652eca.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210608091241_wiccmd.pdfIn PDF document text
    • http://i-dron.cz/data/file/10269632166.pdfIn macro / runtime command snippet
    • http://epoch-making.jp/js/upload/files/20421342966.pdfIn PDF document text
    • http://christopherdallo.com/file/48600034316.pdfIn macro / runtime command snippet
    • http://hrjok.com/uploadfile/file/94971767057.pdfIn macro / runtime command snippet
    • http://www.netcorp.hu/data/editorfile/29538655008.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc9a07c17---kuwakukovanuzukodimalipux.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/paponusitejenutuxizuz.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/98044973044.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/6460279899.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79f399bb1---begafud.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/64771104887.pdfIn PDF document text
    • http://oembag.com/uploads/files/202108261320199364.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/vomabegezidoje.pdfIn PDF document text
    • https://webmenuplus.com/images/file/84270211757.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a59ba70a014---kuzubugufodoxe.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806d1315884---samepamaset.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077c23d085a3---mutimabepojajekidukizevem.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb19a2176f---25192261682.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090d45554033---61359329245.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088dab162a52---22630567582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bombus+terrestris+pdfPDF 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_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 19904 bytes
SHA-256: 224feba3a877811720409c9bdebd045b6f30fdc3d983c1e6e3da76c9787d1d40
font_01_sfnt_off0001639e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1639E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB5 10640 bytes
SHA-256: 1ffbe24707f401f41470619271178d7216688b0fc1e21a9e9d0ea4cffd804453

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