Malicious PDF — malware analysis report

Static analysis result for SHA-256 baac243b7d76f5b2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-10 02:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4ec97d1a323bf453991e53ecd308fee8 SHA-1: cdd781cec90194f69d2c0c4f8097154c6f06ffa3 SHA-256: baac243b7d76f5b24e36929f6e5fc9da5cfe22a441cd284bdedc62993f55fcd7
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 or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://archism.ru/uplcv?utm_term=best+games+to+play+on+android+with+controller PDF link annotation
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613962ced3944---14701984778.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/segewosugi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1595f536---zumuvamil.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/rogavakiken.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/19225723785.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/kubalazorutenaxaxupiwa.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/6407455356.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/66731207223.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/14514571320.pdfIn PDF document text
    • http://cosyromania.com/media/file/nebawaxadimo.pdfIn PDF document text
    • http://asvpp.fr/pdf/mipitesoketowutov.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/xupigetobiwadewer.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/xafinurikuperifopopari.pdfIn PDF document text
    • http://retailcop.ca/files/kivurumarus.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/vajowe.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9bee1c43f---78469728619.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/devepuz.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/wexopejaduzowa.pdfIn PDF document text
    • http://jump360.co/upload/files/20210901074637.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3leg4r4dfkqe6migqtiebmot25/2802017824.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/mozul.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/58376680917.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/96386257558.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_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 11216 bytes
SHA-256: 65a321aa7f77dbfaeadf359e7a33b14d18153b7bcedd8bbde6e3a37e4b3eb8a4
font_01_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 17788 bytes
SHA-256: f949901337b3078bc0e3c9ec678f6affd40772c1121127c3d5b7abf931c0efab
font_02_sfnt_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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