Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd6e059bcfa9a61…

MALICIOUS

PDF

91.0 KB Created: 2021-08-16 03:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5fab2952fdfb378c2c89cbb0dbe105a SHA-1: 1dcbdb5453504d9685996a1186363b6227491d98 SHA-256: bcd6e059bcfa9a614a9a815b1d7aec12a1feb7d8ecc7fca12aceccd3fb398ade
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to compromised websites and a visual download button, suggesting a phishing or malware distribution attempt. The PRC/3D content and duplicate object bodies are also suspicious indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 8

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/k76n065u8fi2t0ouia49lljrh9/pesuxovuz.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3c7905cab5fb88388962a69d31b09890/93239665329.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6af767ae903dc92fec47e1a01f332bdc/jevogawoxuzovasemo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609657213a56b---lijakavevejaxitetita.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/vepewololubifosoguruzizi.pdfIn PDF document text
    • http://derma-dts.de/files/file/71096989739.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/22970776832.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f08909064a---xorus.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/gamejesopabuzasepefirabuj.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608182f6efc81---letazake.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607796a760eb7---ludoxifuxewuso.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/15396852369.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wedibubovegam.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/lasatotodevupejo.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74510a86c030f56e9e6cd4a45905df34/67253380846.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e32c2c8655---zeserejanuti.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110900914145---newuxibiratukigapukagesob.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0b91267993aa1f169869a34df28dda89/55545904287.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6tvl02nkc1i6h2uh4o41rddc17/59933970887.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4840fffd851c5e2bd22e89a6e36fb934/kazawizanuvalugider.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/debuvokesazijafoka.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/napopuxevifina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=jesu+bleibet+meine+freude+free+sheet+musicPDF 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_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 19872 bytes
SHA-256: 8203ea436a6263959ca97cbfdd65068354481ca68ba74730f172680589fdd427
font_01_sfnt_off00012df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF5 10688 bytes
SHA-256: 5483c75fd9f5704c8146f9c31c4b9d5de7c34a94695b958902607b7926786288
font_02_sfnt_off0001463c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1