Malicious PDF — malware analysis report

Static analysis result for SHA-256 9608cb6a3bb299de…

MALICIOUS

PDF

80.0 KB Created: 2021-08-14 02:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26fa25f35bbd13cdb01e38ecd4eb502d SHA-1: 84ef11f148406891b9e5c2c7a1a2c9663f85f76d SHA-256: 9608cb6a3bb299de5a9c7c9951376ed73afea28ba9e9fc05deb80387f043452c
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of multiple links to compromised CMS uploads and the use of UTM parameters suggest an attempt to manipulate search engine results or lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://radio-salsa.com/php/rs/filesupload/file/delitasegulakef.pdf In PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/0eab943dacfa0d9946868409aefd40a7/53186029631.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/2vnla5cp0qbi5bqhp17aq6ogt8/589575611.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2a783237---jobelalekojedajorudi.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/gadiloninifixanired.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce178262e---27133465589.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/52ll9vgpipj7oseou66njaahd7/vebeboxexup.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1962120639.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/52528237931.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/jazoxifegopisaletoxered.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4efc3b2c0---goloxexagizaromafilonefof.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/nulojimaja.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/lunaxejerizad.pdfIn PDF document text
    • http://kaies.cn/upfiles/210530062007730531zxjgwg.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b868a8afd7c---xekijakuloruwas.pdfIn PDF document text
    • http://princeverma.in/uploads/files/74520089434.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/winugijuxalusatadizufegiz.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161061da689fe9---pewisosamunofodidosupu.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/95382277224.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5lc4v6hgokmjn24dbb67h8aj6r/30349864044.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/qr8opucho9jubcq7409evk9jr2/tuzirojetilizazilaw.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/dc4587410e3737e3c1defe82b6a67cdf/rolemosetaz.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/vivalelamabujijajapagep.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607688ed94582---61883547189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=los+ojos+de+mi+princesa+pdf+descargarPDF 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_off0000d17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 17488 bytes
SHA-256: d4857b6be199846580d8e0a36895f5c15c0090b382ac323ec60a135901c34f87
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 10904 bytes
SHA-256: 0a286220f87d5b0ac54611a35e2bee8c4432524a651d989fd9089a95be934383
font_02_sfnt_off0001170d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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