Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f14fcdb423d35a9…

MALICIOUS

PDF

96.0 KB Created: 2021-08-06 13:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d23191dc36100e63c40742328086766d SHA-1: 450b70542a2930bd10fad5bdafd5db0af601b2ad SHA-256: 9f14fcdb423d35a958835d700a0b901f6a754ef08d7d874e8ab3b6838b673d64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://crysiq.ru/uplcv?utm_term=electricity+and+magnetism+notes+for+bsc+pdf PDF link annotation
    • http://live-lessons.net/lcj/web/uploads/assets/file/fuxijakajobibagi.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/89613449932.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/2df1c41b974a407c7bfb532b54339f74/56814273609.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/tanuregesevotujujijad.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/tikadejozu.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/45856727629.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/28020253709.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/cra0faoggum9bad0n0e1akio32/fifumavetino.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a2f3d76c---7102060372.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/jedigeratopobazaj.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/ragabi.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/tijedotujitibekobo.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/98050835099.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/657069a440c0a50623be741aefee8537/49191336637.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210715235908.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/pepadifafelegapolen.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b8f935378---pekasozovo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b231f57fcca---selubudigam.pdfIn PDF document text
    • http://ladakhtripmaker.com/userfiles/files/xosufibajigokebiwamuvo.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/39349099384.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/lowegunifizifim.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/65460118046.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/vaziganu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001021d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1021D 24276 bytes
SHA-256: a6e2c7e903af6d063af61e57d622939d283bf8b1d3133fec5232a09d830b66b1
font_00_sfnt_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2D 11200 bytes
SHA-256: 6484b36be5056c2c3ec61584303174fc94a7b20dda47269a579f71540068bd09
font_03_sfnt_off000144ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EF 17172 bytes
SHA-256: e8bf04677fbc5d27bb0cc552d5f9969848b58029dd305f53f4cd0dc3785a1d73

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