Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd201f3375253268…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 02:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df2e6e37ca2f814b6106331613e413cf SHA-1: 705914dc2113e04ebc76b00b6fb66e46de295615 SHA-256: cd201f3375253268c5d18e63f825d4dbd81222cbe42e2e34b294dd4f92daa8a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely responsible for executing the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=gta+san+andreas+cheats+for+android+keyboard PDF link annotation
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372ed74af1a---38868814650.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210909013027729152npxgp.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/16367710106.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/dowologobe.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/64159850510.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/2146872770.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f9bb4c3845fdbddd0293ca6516b3da0d/57248721902.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/nidubexeset.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/zaludepezevudipulewap.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/89721305630.pdfIn PDF document text
    • https://wittnebel.dk/file/47856925769.pdfIn PDF document text
    • https://expomediainc.com/upload/file/kopukosozukamowonemo.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/rizoxibenefamakofaz.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210921_071523.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134954bbcf3d---29911425556.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/17218595187.pdfIn PDF document text
    • https://ka-base.no/images_students/files/47435376190.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gebexudiworuduweb.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/xijosamokunaba.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/rodun.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/46748220147.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147aef760647---juxipoxopanuwamakol.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149f874cd225---jiwele.pdfIn PDF document text
    • 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_off0000b282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB282 15756 bytes
SHA-256: 3509cf70691388553cb45e7c7c1731e6c2bae29d7579ad5cdb053bcef1627700
font_01_sfnt_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 10912 bytes
SHA-256: e8f238c248d25be5aa77e036f4b06c9bd83abc86c68600ca26d6411c51306be2

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