Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fbb51e46e288d8…

MALICIOUS

PDF

99.2 KB Created: 2021-09-04 09:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8eea5e8cd971d68913fa860aa87b7cc3 SHA-1: 4f72e8425388405f6ccb8bc6736b3c9c880d4c22 SHA-256: 64fbb51e46e288d8e8e53dd43bb1eed549bb4590f536384577eaa419d720df22
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack where the initial PDF serves to redirect users to further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610261189d1a0---43305368007.pdf In PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2b4b0cfb---49206390763.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/89897843460.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79849d8d09---12251283329.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/97022670643.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/dotilifotikemivujiponata.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/61290976142.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f95770d0c4672b290368765625850b64/22308549688.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/zaxax.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbdc87131c---mogemibibuladiji.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/17166963536.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608947e425bf7---76137021447.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/558883490.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/56933542505.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c52788ec808---numixodapibiw.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/xemosipapa.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608141d89736b---terikeluxuz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/134b7986f5d1d8fb5b48506da469b11d/91910136793.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/lotidegelilumezagepetew.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qgmga95k0ltmvaogqau1ebhih2/lupisapoxunukusa.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/9oiuu2h2cdt094lmethc9er23p/96599406366.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/51182192502.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58da7928c4---xurapijitonalufixokitip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=3d+scroll+saw+patterns+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_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13874 10684 bytes
SHA-256: dd55f2807d77f516effda7ad450c0e8c62c91aca5f4bb0029f2c732e6beae3da
font_02_sfnt_off00015129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15129 17780 bytes
SHA-256: 689f98cf5fc04c7f85e930a94e76205aa27732d9146e79b662cd32d06ef62e6e

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