Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fbc7f0ce031051…

MALICIOUS

PDF

96.4 KB Created: 2021-08-25 08:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e74c20c39416023670cf524289576936 SHA-1: a4a3169d0093a07aeb69bd0e366d2f651628c44a SHA-256: 13fbc7f0ce031051be15721782ce89782acae2366a88204c21b4a800982fcef9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://emannsltd.com/userfiles/93469214938.pdf In PDF document text
    • http://nowyhotelik.pl/userfiles/file/10552409490.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1891a4b9---wakevonulexir.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c8180293---71342105806.pdfIn PDF document text
    • http://safarang.com/basefile/files/31970576669.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/161319e1e1a8f8ca61cc8d1102dfebc9/madekepetikimosimal.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210516053536.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/99566065363.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/vosojomazoxivabonate.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a17cb7da2---fejewuwunemaxew.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/14215155324.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81209330418.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/61bc4b547b9a4600537708958b279ffc/zorizepatorunepatawewa.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/u5kh5o6aetccn9df1dj2uedbb0/75900834458.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3iajvk9p0trq8dmn1j0f549q8n/41186837605.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/hul72fvfi3vu8knvtovi5g3oeh/domixokugiwex.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/46500319689.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/dezenegamiwixado.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nubodanujo.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/87011557501.pdfIn PDF document text
    • http://rilta.net/userfiles/files/fofuxidi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c2ae5e2d---velixazewagenad.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/56278403804.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/gapeduroxagomeneb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=introduction+to+vectors+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_off00011316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 17992 bytes
SHA-256: e8b2d61deda6c0e68b14422b33900a6ef61c644ab5aaf48bfe437ab93fc93971
font_01_sfnt_off000142ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE1 10524 bytes
SHA-256: 38d6c4aaa3441d6553e09f74bdcab54c6060327e4ad7200f9ceeda9eeb907963