Malicious PDF — malware analysis report

Static analysis result for SHA-256 6102e05ae0bf79c2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 23:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a37ff6ccacdbf67dad53f4019e227e9f SHA-1: e844f0bfdc59c6c7eb385a1028dd660d2c6a1dda SHA-256: 6102e05ae0bf79c245f60f7c533a4215bf4fdf9e8b44e828b571801f156ac1c8
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=cpget+previous+year+question+papers PDF link annotation
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6855bf584873ffae14fd4973af953213/55509832223.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/dufafimisovubowufopugakik.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/zexufawoxepexepake.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70cf6d9744---89196849706.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160884405f2cae---26853995279.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/750a1dd2c7026c3264dc559c20855239/8331099038.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/8665554474.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/volikaxobugemodetizevom.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7dbf14c59---59200174897.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/javexaw.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df9fb4346576094695e3ec2416e14a79/sagugofol.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/16708787556.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/sadudejagazifodisodag.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/6ulq3em4qv9e34i342lkvra8u6/96612013600.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c127cd659a6---pakegu.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/gunozen.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7767319d3---42048196968.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/266c6ecc9c8df5133e1338d86cabbf13/99535007280.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/3f3f28a51666e57c9f314ca0987a9abe/64984061089.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/67211293351.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ok5d1ad84vd85av5iqeaou3n1u/tujizexemagekiw.pdfIn PDF document text
    • https://7gking.tw/upload/files/bozaroxifotavosu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a39fb3a350---47137055714.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/tepijuvotofiwanuki.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b10643567991c0b2bd8bd4a069537e36/nuduxigaviwaxixa.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_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 10836 bytes
SHA-256: 0bbd801862c72474c789cf91c3152deb1a9450b97c936a3807f9d11dc4969b9c
font_01_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 17776 bytes
SHA-256: bc035b6d6d8e277563bd3875eb0d7657c23586ad011b0796e9481e3525242fe9
font_02_sfnt_off000124c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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