Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac45a212f9225ac…

MALICIOUS

PDF

86.5 KB Created: 2021-09-16 00:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 98279cc2f5edcc4e29be3460dab64b71 SHA-1: 52ce4141b8228a92109e9f6477e486aabcfa1022 SHA-256: 8ac45a212f9225ac062961c35f6bf7dbde1a05a967f7b2b6a2d04c55034a095c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to execute malicious actions within a PDF. It also features a link farm pointing to multiple compromised websites and disposable hosting, indicating an attempt to obscure the final destination and evade detection. The combination of these elements strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=roblox+how+to+get+free+robux+no+human+verification PDF link annotation
    • http://bassbasement.org/userfiles/file/48629373933.pdfIn PDF document text
    • http://findacommodity.com/upload/file/tufuj.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/kumusimubemit.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/43234815400.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/3hd8iu209sc3f6fo61kp65t5it/lijixoxiwil.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323c144e75b---99230960434.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/48834556970.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412f9db4e08---23703083665.pdfIn PDF document text
    • http://ty-int.com/files/files/41089261268.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/37117388514.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/kisagutet.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a378474f02---fabozujakozoxesawonasino.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///83663829331.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/2664987470.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/nilutezajotejimajug.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/55122388155.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/bunosezuw.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/72235486292.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135a2da72ac2---zevakofo.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/93085605317.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/8893586076.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/dugemuzegoludupedefapebex.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133de73b65ab---1674387946.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/fufasubumugipikupik.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/robazuzus.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_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 11152 bytes
SHA-256: 8a57e5a3406c560f96dba3a10777fccda5ed02f85d2fa4faf1a81b2e03d19b79
font_01_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 18592 bytes
SHA-256: c533f90bd2ab3b577729e0fd6a744cfe2fe45792e90f403b6d9de558fa5dd5d8