Malicious PDF — malware analysis report

Static analysis result for SHA-256 1899eb76d1100c62…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 02:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 781ff8c75f95d718c077997f79439670 SHA-1: cefb17b421bb14b3650ef5d0631dabbe9b9efe34 SHA-256: 1899eb76d1100c621d9c6230fc31a459ad34216d7d2a6cad82ad620f3d84c0bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs, many of which point to compromised websites 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. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://coretry.ru/uplcv?utm_term=schedule+planner+app+android PDF link annotation
    • https://raghuvirtrading.com/userfiles/file/xibozuxeziloba.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/69470451463.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/23851874585.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631702732.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b0de17422---10640357733.pdfIn PDF document text
    • http://regmac.net/userfiles/files/18315590188.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161372d82b1424---63389146916.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-1/20210901203056466931.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/49078329225.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/87645294253.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ae2f9b1a3333819f948a2a27268b6c4b/70648806024.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/dukilufa.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/79528977747.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/83677841653.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/35250710013.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/2433399181.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/64527645369.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/74120346076.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b5a82b1c6b234d1131b2ee2d2c4e3484/tumeririfutusonolekowuf.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/xisokokixobedigamamut.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/6p4lfe66isf188653l33mkob66/13956701701.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/140634316159.pdfIn PDF document text
    • http://flirdining.com/uploads/files/42222117292.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109071750495611.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161330f8dc7ce5---bumapunusagoxepikesa.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/57801249434.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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 17396 bytes
SHA-256: e7e3e24f96ccd106700dd1441f3e8d8a4527d9d1868668d732b02e80004aac57
font_01_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 10520 bytes
SHA-256: 921ee9e8e8005e1a0748799a33890fedb4792b4d9221f4a277d9f5f44e3042e3

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