Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac9f4f1de8eb412…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 18:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea1a0081100a81c6d34e70b9545f8fb9 SHA-1: 4e3473ea2a75d80ce6a411583f95df0018d24d08 SHA-256: 1ac9f4f1de8eb412111251469ff658548fe63bd36e60ee7d1d95e1bbab1d8516
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are probably used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=stick+war+5+mod+apk PDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3fd9cd4b8---wuluza.pdfIn PDF document text
    • http://dolonchem.com/upload/files/31621662396.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/25312634435.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/88653422806.pdfIn PDF document text
    • https://produse-zilan.ro/files/kisizuji.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b2fe590287748b54bb8589ca912e7c5/lelilivowalu.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/90560955095.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/98202999326.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/84190598352.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161487710caae6---45019710082.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/zarazun.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://ghalemdi.com/userfiles/file/60864003774.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/89718906332.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/495ab10495d5e770359a0770c5cdd4b9/mefig.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/97007776464.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363d9a80abe---80866613137.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/35148069362.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/januzikerav.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/83219994972.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/69148043896.pdfIn PDF document text
    • http://schokozentrale.de/idata/64036924538.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/lamabov.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0dd537c32---tupam.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/33108305076.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/34239187201.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_off0000b3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F5 10612 bytes
SHA-256: 805649a2a0761bc608cfa9557f715c1842cffce80fa6995227caca65d67a6879
font_01_sfnt_off0000cc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 14992 bytes
SHA-256: 92c4ea4092258deae85e78dfdabedc133f4ffbbc90d31bc347898a195280f526

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