Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee41429d2e9ac617…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 10:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd1ec215c8fedeaff31ba9f4b58dbebd SHA-1: cd74a601636c323b6a5505917c0ecad9c02d7c7f SHA-256: ee41429d2e9ac6175bc30b5d0e6b2cd40c9f1fba93f7b07bfb5fbcc7779511b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicative of a link farm used for phishing or malware distribution. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://1000projects.ru/upload_picture/file/69032106253.pdf In PDF document text
    • http://train-in-japan.com/images/blog/file/wugijugemotopevukima.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/78467996936.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/72001727679.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467ec31ec27---89954903218.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/virowekixutuz.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/puralivomifop.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/45513904537.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/xasip.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/27850863299.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/bovevobejelamidu.pdfIn PDF document text
    • http://jswenguang.com/uploadfile/file/4141382042.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137c16e82f3b---vezedirajokolapugalo.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/tatef.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/62397252399.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/h7r938dkuhal71lg146v6keabj/takisesul.pdfIn PDF document text
    • https://insp.biz/img/file/nutozadariduroraka.pdfIn PDF document text
    • https://kaparatt.com/images/File/98550623886.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/fovotodunajupuku.pdfIn PDF document text
    • http://chemicalengineers.ie/images/moronunuxazifogajakevexew.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/65976590523.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/bosekakodoketomas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=jcheater+san+andreasPDF 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_off0000b28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28C 10200 bytes
SHA-256: c114b96d608e3b04174f672ff5db89273523b1fdcfc4c1ebf8a0c35ccc28029e
font_01_sfnt_off0000c967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 16564 bytes
SHA-256: 279b453e7d054039a29776473a10bdefcf1a375dc24aed8e64c28c6ac7068e39

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