Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a40ffe5b11d3fe…

MALICIOUS

PDF

100.7 KB Created: 2021-07-31 17:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e1f46a7c70a2816647a1a7b689716ff SHA-1: ab6693d296bd64b9d9433110d7933cb44fa8726c SHA-256: 19a40ffe5b11d3febaf84860a3e1c9993ded300cb750acbbfdda2a05458e2188
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 to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cructi.ru/uplcv?utm_term=how+to+do+a+flip+trick+in+touchgrind+skate+2 PDF link annotation
    • http://first-group.kr/ckupload/files/59544155134.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/wipajexu.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/kitiwavejefopejesij.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/8494691171.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021073118170142.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9fff64817d6106448410948d9da8db85/27404600181.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/17045107334.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/50402964504.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920504491b5---57439740932.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4bf108ccb5f6a441bf5895df83bade5f/12117901639.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/80ppdapcuh3v706ptv3jsl5g25/savalotisalezotogoku.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3adcabfb1---wajipapodojubizasemo.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/zebavuf.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3dafed858a36e9329ced99bfbe7b99cb/15666651624.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/49860534613.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b81f6d06f---robalexijaj.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0924193909---11044873981.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/402580317.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd2c62d64---86058017241.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/gexamazokalulugeloxazak.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8b35c25c18c2fdfff00dac0167feea11/gevijagezinemesak.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/35329010246.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef091c2e5---60769530092.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/neniwesadodovoxe.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/d39e8q9vakmgnmqr2ls59dej01/72719410079.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 17604 bytes
SHA-256: 29a82212a0e81d8a66ea50e2d3592ec9605dd84b460d2442ff0577629357b595
font_02_sfnt_off00015142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15142 11288 bytes
SHA-256: 6ceb406e5c0be5e1725e5ea7fd6756bc06d98d844b0500449c4b9fd5cd367bb6
font_03_sfnt_off00016b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B8F 16812 bytes
SHA-256: 0408d2b76680db936abb4386ed20786780310f1d0e02ef3f7dd2a63f2fb7f242

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