Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae01b9a45ddc0eb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 03:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 373447210f281e0c714884e70d10f7b6 SHA-1: 8e7b37070620d34b0cf289de0d8f47eb98d46a6c SHA-256: fae01b9a45ddc0eb3f9de16ee365c307fa5913f5dd08015115101695647f0cbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=c+diff+side+effects PDF link annotation
    • https://s-h.cc/uploads//files/202108020936039227.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fuxopoxosizaditejokukozil.pdfIn PDF document text
    • https://areicon.com/images/file/97200899422.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/mazovurudopevosabiwano.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/dumukijavejogogenunamej.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/tekorudumolukamowekus.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1ca89c3c13c5bb4e5d3f2264619ae01c/12803230846.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/23069227073.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/33f1d4f96a3e93f5af46b6f777c0ce01/61634589716.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/fudexozasabemower.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0817727d342f5dfb97551019d717a86/nurisat.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/bms82ame6nsgrqk2h67drjbjlv/xufuduruwokabukaxom.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/bobexevodatupekiwepivaje.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085753e942a1---68554549736.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1a5477b75---1159169885.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/51447695444.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/zibiv.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/17983665332.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d438b762390---xiveginapafedogifowemoke.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdf2cbcc58---91065287318.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/rogemejigawilusot.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/jujixozaroro.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610436bb4c9f9---72933727539.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/borujeno.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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 17692 bytes
SHA-256: d7b1a8ddb9c29bad41090432847b2694872ea47da48ca7b99608511548362231
font_02_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 9968 bytes
SHA-256: aca5d20bb263be0e191de1270d86b22683ef388d55d752cc0f55371b2fb9030b

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