Malicious PDF — malware analysis report

Static analysis result for SHA-256 9008fcfc4a22ca6a…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 11:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d757d469bf53eec640de7aebd5fec8b2 SHA-1: 4a4e257e6046148b13ff03f71057d7df7e9c4e23 SHA-256: 9008fcfc4a22ca6a8dd2b82a617ee98e3ebb193a1f6521f2611b9b5590bce92d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087bac625868---regubifejexamutigisakiva.pdf In PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609115ac72780---lowowos.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/sapoxixonanelezonoke.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/52276102973.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210522053339106.pdfIn PDF document text
    • http://wwstationery.com/files/file/fikowiboxolelifu.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/41514328801.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/dafutev.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/demodogilimovefusalarobox.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/mojizeguxutudepaxi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d46d913509---9252873370.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/31739541442.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/76848774173.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/vubotifusizorowapojobi.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/zekud.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/47273790757.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160879d3544c74---86172951092.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608712f45f192---66081266949.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/57323906797.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/18271221438.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/17771170383.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/81302148247.pdfIn PDF document text
    • https://tckontrola.hr/files/93521081826.pdfIn PDF document text
    • https://soechi.net/userfiles/file/47630919306.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91cd2ac1116d0c939b6d8e856edea653/popakofawelisarajit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=audiology+diagnosis+book+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_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 10768 bytes
SHA-256: 17de6f7eab9c6d160c97ab316219acfc92b9da950f6ba546b224e67b4f2a4565
font_01_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 16772 bytes
SHA-256: 5b2bc9ef85f870629a80adbf62d650241f2c7cd432a036e956796b145ee10016

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