Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdb55271650823d…

MALICIOUS

PDF

86.0 KB Created: 2021-07-17 11:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ebe0e75537cac1d2d05521adde5b5602 SHA-1: 73ecd3b46183cd795fbd4bbb958d425a1b7cf8c4 SHA-256: 2bdb55271650823dff3de2d6641d26a074dc7a1dfeefb1489c9641ac439baa87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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 http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/45404833513.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/69729d48e5f6a5c1c5a8d8a025905e1f/1850621186.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ebc27aeb2---xuduguvenowubukofovatok.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7b08d45e9---6950060421.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/459f7be12c8312f6a97b2dd4bac988d5/maguwilaga.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/nenafitonaguxisebobaki.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/169d228b5228fb50329f940c9e316377/dalofinunapufilawogagu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bd632b28ab861985c3293528d363a7a/xalap.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096b38995fba---galozosip.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/1145168246.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/2717577244.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8gu8r9d74m3577nj28q6p0iluu/pumumowasi.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/40079597795.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/73411025394.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3fc33e0b3---90431932692.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/gh62jah6g886dl1n6vh7nae3pb/likeboxiti.pdfIn PDF document text
    • http://lederstuhlshop.de/ckfinder/userfiles/files/51882106327.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e25331bebbaad76b81bd5b2971fd40b5/13965049252.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/76810590687.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/74608321033.pdfIn PDF document text
    • https://actorconseil.com/files/file/98892667506.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0id0656df4e90ii6qm0d7mlmq7/vijemenisotikixigedaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=uyire+serial+colours+tamil+song+mp3+downloadPDF link annotation
    • 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_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 18680 bytes
SHA-256: df48ec16e0ee55536537a02c78c20aba52049d37964977b7a7cd0bfe4b765a7b
font_01_sfnt_off00011816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001302d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302D 11336 bytes
SHA-256: db1584ed978c59f887998027bd5c15cfe523034c80216f49026e7784b24517fc

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