Malicious PDF — malware analysis report

Static analysis result for SHA-256 b695d4e75d26b564…

MALICIOUS

PDF

85.2 KB Created: 2021-08-21 13:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 76ee9d199f224b07999d765b32229ddb SHA-1: 77fcad94315042fd33e4fb26ac7274fa55f65eb6 SHA-256: b695d4e75d26b564ccfbd15954e0b8ea225e5dce2187cfa34a0687b5b5d3544c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting vulnerabilities or distributing further malware. No scripts were extracted, but the link farm structure and heuristic firings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/tetefaf.pdf In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c25ca6d18---nizenuwim.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/356da64b7432e90690138419ef8ee7ab/fukudate.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/32c8rns2apmc68n3mfknjrhtm7/96063556126.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/rinurutegidolinedizixid.pdfIn PDF document text
    • http://www.celso.org/download/buwinuxatu.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/c8b737ab40ac9e83c0b355f742d51c7f/dakob.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/satukebi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072f69e705f2---57406873360.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/86285978250.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/wudoba.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/29630942255.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c493a52e---juvefirukotode.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091fc9f2c455---57526501656.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b96165ac---mufunuvedij.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/3eb619fadff29af4435e41c25f966a09/11240629109.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/304474300.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/83788839596.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821d4fd7fa1---gifegositurupaf.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/122625cc6669d3ca958ac71be686e32f/xokufigax.pdfIn PDF document text
    • https://doganagolosa.it/file/8805096381.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/gavexoxezukatatik.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160daa65620a59---86953780795.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/nujizosunilukenij.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7aa2962f2036f7f72edb653c7c172dbd/gizumadoxurevuwelegejoduj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+adb+bypass+frp+tool+2018+latest+versionPDF 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_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 16868 bytes
SHA-256: 30fae6afc79d79a369b2ae8a6a891ab3bd0a382263f3fd7a0022af3f4e62cef3
font_02_sfnt_off00012aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 11400 bytes
SHA-256: c64a1df963f905a2eddf8033f13f076396af468eb8bcd89b8d0521558bf9131b