Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86082a9581ba291…

MALICIOUS

PDF

72.2 KB Created: 2021-09-27 19:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa46ae9f1b9bc5c526b85181b33fcfae SHA-1: d3768cd48e37e8374d767c657cf37c0bd2f4f7c8 SHA-256: d86082a9581ba2910badc33bf180afde91160bf9b34eeaa2c1aeca5c3eca4195
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=4d+live+wallpaper+free+download
    • http://dsagco.com/Upload/file/metadalakejoxewip.pdf
    • https://durgabas.coop.np/ckfinder/userfiles/files/panuxopaxetaloliwulano.pdf
    • https://www.solucionaesp.com/ckfinder/userfiles/files/7143438316.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150343dc126a---lanulofum.pdf
    • http://vdi.vn/userfiles/file/6759686216.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d466ae0048---vemomiparejedopigeje.pdf
    • https://habibitours.com/ckfinder/userfiles/files/josovavenuvewo.pdf
    • http://ivankrivanek.com/userfiles/file/72259609080.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zujuxusige.pdf
    • http://obedovice.cz/userfiles/file/damidixikotopajikilexij.pdf
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/40648117663.pdf
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/retime.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/20d63c8bf0b609367b7c228587a3bb6f/93567669713.pdf
    • https://hoya.hr/UserFiles/file/53400928377.pdf
    • https://ladulceseguros.ar/noticias/fckeditor/file/58294564317.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/komapet.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/ligelaxukamofilaked.pdf
    • http://4bx.pl/public/file/pifakolutuzutagefibikulun.pdf
    • http://clear-es.net/yamituki-n/uploads/files/bagixuvaruwu.pdf
    • https://hyundainhapkhau.vn/upload/files/luvura.pdf
    • http://www.jokilaaksonratsastajat.fi/file/vidaremebojukeletav.pdf
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/nufuboxiribarefatobafude.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/12963746699.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36587542479.pdf
    • https://superchills.com/userfiles/file/dumebun.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b669.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB669 16792 bytes
font_01_sfnt_off0000ce7b.bin
3ec5ecfbabf7818e036f06095562b6ad6d73fb9fd32cc04855298862c8c1c9e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 17604 bytes
font_02_sfnt_off0000fbb8.bin
5df99db234cdd784bce6be68dfbd68f976c029c1fa6a06fed02ee32f8522a608
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 10356 bytes