Malicious PDF — malware analysis report

Static analysis result for SHA-256 87654c763f11ab55…

MALICIOUS

PDF

92.8 KB Created: 2021-07-05 11:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b11638fca48c7c7abc255b3827749d57 SHA-1: 45130b8d2c4f71b83326d455ab00418852a2bc25 SHA-256: 87654c763f11ab55748489c562666335e7af58af8b24a2c03cae29ff68431ada
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and a machine learning classifier. It contains multiple external URIs, including one pointing to a raw IP address, and links to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users. The presence of PDF_URI heuristics and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf484fecc---34372185598.pdf In PDF document text
    • http://yomamasushitogo.com/uploads/files/6170788286.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/4061602480.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210611112819.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac76e5c4d8---69637829392.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/vumedenomikedasevokejab.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9d4de8034b3e83de17b907453afb715/22413588465.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d0d8a5534---pelakimolujorudepavupaf.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/0038788060bd920c269d804254c7bf96/xotedudebadujesumexomex.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mvj10a37v1egtmbq56gnbnf0u3/17984763358.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3b25af5877b71db0a7d20b56296c83d1/rotububagowarejo.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/2385835612.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac863617d61---merebi.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/21599091183.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/23598309064.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/sliqduo0iusj228j7q16eb6q86/23129564521.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c60899d42---11854483312.pdfIn PDF document text
    • http://teraval.cz/res/file/febawumu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b31b0239b---24364459731.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/de58390407058cfb3fb7d2271baddd48/tafuduruluteb.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/j0n712psq660hhohdnvcp66nv5/sojawisemoxarozopoposudu.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/senokefok.pdfPDF link annotation
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/313c5256df3d616eb8e0a34688ad7b44/luvebat.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/65994479655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dnd+5e+monk+weaponsPDF 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_off00010ad4.bin
05991e3c4391310085b3416df44bc57486d19b0783facf8e270598e51219970d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 16704 bytes
font_01_sfnt_off000135ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135EF 16792 bytes
font_02_sfnt_off00014e06.bin
442ff0c507564ff3e43c1444f35bf43cd5116ecdad528dbdd4c51adeb1ee5d00
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E06 10532 bytes