Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7f35230acc9c78…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 16:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b3b015b7ea7455a04393cb769f90e6f SHA-1: 2dbcfdadc44e625d7fb37ded03035ae99d93cc3f SHA-256: 0c7f35230acc9c780d11b6196d75fad7071a6f0d41c7e53b60b27e6fc15e3bc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites. These links appear to be part of a link farm designed to redirect users to download files, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01366a6d1---wukupaponazasa.pdf In PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32998274724.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/17502941107.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/3923388860.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/rudibutafirevozodutorar.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/65246625601.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/88301671428.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/wojoliwufage.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/79432875183.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161311a033de5d---38156164639.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/82364134728.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/zamovixakuviwa.pdfIn PDF document text
    • http://93564497.com/userfiles/panir.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/6b53abfcb251e140b2bb86ef41881a8c/27245672576.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/77019611382.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/4984022182.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/nozexelalirumewi.pdfIn PDF document text
    • http://quranday.org/userfiles/file/wamubo.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/wubore.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131933f29656---xasimasafufexabor.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d0e26e77738d58ce171aa86fd8e7df7d/segude.pdfIn PDF document text
    • http://www.agot.pl/upload/file/tigudu.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/89313812013.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/tasor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=temple+run+download+old+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_off0000d46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46B 17232 bytes
SHA-256: bfa65fba98fb55e2b7b7ef291f8a6f3bd6703d4821faeeadc889b3229d1f5b38
font_01_sfnt_off0001008e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008E 10668 bytes
SHA-256: fe5e2e1062f3f9359047bd597c4946444d4bce295bbb14f48acd1394e0e66a0f
font_02_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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