Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0d3d75988c9da9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 17:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b383c9b2f5745661356a9ccc95b643b SHA-1: a6fda57d86e33a08eddde2cc4624998bb064eb20 SHA-256: 9d0d3d75988c9da9531955a64114ffbc2967de38ed9ce85b571bac2a6aa6ced2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pixomot.ru/uplcv?utm_term=properties+of+whole+numbers+worksheets+for+grade+6 PDF link annotation
    • http://shophouse.info/images/files/tekevor.pdfIn PDF document text
    • http://vettercycles.ch/userfiles/files/21667083025.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/bpcv5g6v721ief2k7e0qa8n86q/wobujogizowejinaza.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/262c18c6bc33ac148004534cac9f46bb/tirenidemamuk.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611162537f718---veloxofet.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/zipudomi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607409da6c63b---katepunibozarevope.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/darediwemawabiwetavo.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/96673922417.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/75385191544.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/mebovexuwozuvamef.pdfIn PDF document text
    • http://hkalc.com/userfiles/neriropaburiguvugeg.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/61984291809.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/39796832742.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/28907693414.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/guxos.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/88606021533.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ck6iasm3m54niln206ntqb05p4/jugimepinodobidenevevuxi.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/gusoravuxarage.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/16ba13e17f8f51a7d54ecced5a615ce0/xupukup.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/goduxujit.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dad0a40c7---76539796080.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb940f3e76---xilatabisarisifopidoketa.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_off0000d3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FD 11532 bytes
SHA-256: 8bc85eefd264d8d5acff6bac60c48b310fbc4ad153d4f716f52ae2bc77eae5f5
font_01_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 19016 bytes
SHA-256: c874a314c1974668f966c938d7741ec4374cf80f16584fd934cc01dd6abc78e1
font_02_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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