Malicious PDF — malware analysis report

Static analysis result for SHA-256 1009fed6b541c35c…

MALICIOUS

PDF

71.6 KB Created: 2021-09-07 09:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 0887072330c4127aafe80a03d76cacb5 SHA-1: 5c6858ea127424b1f0974f454cae3b19b109a865 SHA-256: 1009fed6b541c35c3742b07d48e7745732c76fb9ee3b28613721105696c0432f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document's primary purpose is to host and distribute links to potentially harmful sites.

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 https://huntic.ru/uplcv?utm_term=tipos+de+cristalizacion+pdf PDF link annotation
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabb97de09---45407257889.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/noxidosi.pdfIn PDF document text
    • http://chinalabware.es/d/files/konofuponoxerenojewogonig.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501093029230308.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b8f2307b45b9795ee9cd87361577f10b/6515488616.pdfIn PDF document text
    • https://cncunse.com/d/files/83367913803.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea7f3bfa8f---vosugigufugori.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b9b9838b---84262780035.pdfIn PDF document text
    • http://hospvetcentral.pt/site/upload/file/40014923041.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/lk79a1o3fntgkm1tcjlov4i1kb/56198459968.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/wijivuwi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1281f4fbdb---tivamiruxuvoper.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/33823042380.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210811155258_9gy48e.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9de5c502381acc4755b74f3fb40513c0/kozadezomunetadawagorafol.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a238db92---lamav.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b52a7397---61889375104.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/um5bfgt1v864seake4l3s6eom4/66518685408.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///ridijifi.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/98980b8664958f6d9c9fab0ae55de28f/26924923247.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4e982e87b---gonujep.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eeb22c9e4---dusotilij.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/paokqmitjolo3kdh56um77clq3/64325355787.pdfIn PDF document text
    • https://anfauglir.com/images/file/zusosexudiluwuf.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_off0000b84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84B 16192 bytes
SHA-256: fbce75c014cebee5479ca6a83d37b9e55f680454af14d8860ec221d2298ccf39
font_01_sfnt_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 10636 bytes
SHA-256: 7c438217642cfc65810b889c8abe1a1ac7a76cfcc89b926df99736d163a1eedb
font_02_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1