Malicious PDF — malware analysis report

Static analysis result for SHA-256 018e0aa520a4d942…

MALICIOUS

PDF

84.5 KB Created: 2021-08-12 14:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54b49e530b49ab676f26fd8663886fb2 SHA-1: a9452f3a304425abe62b4d25847dab26dda7e4ba SHA-256: 018e0aa520a4d94267ec76710a30797a9e365952c3f77de621a1099df2bc370e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The embedded URLs and the PDF's structure suggest an attempt to lure users to external malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9276126198---texegotodixupikup.pdf In PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/fafubudabasoveb.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87e76041d9---tawopaneretomewewimime.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/gamegekane.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/zajebejewogigasexuzito.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021072500301673499.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021062714575770554.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/57307989419.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/grkeiolo05seph99e8hbt5e638/kupenab.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/48128814153.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c69e18695e9---84711213633.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/8f46995ff65c05d19c7c76de14eb8895/27322083815.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/47082728006.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073811c96b60---goliro.pdfIn PDF document text
    • https://bselink.com/userfiles/file/sagupujelav.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa81c595dd9---jexab.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/fotowud.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/falutolaxalagafape.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a11f6ce5b6f---vitujaxutavagoxovema.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f4b34fdbd---penubotugetifokaboniruna.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/70833713346.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e4265553ca1ca5939fcfb7ba5d7c3e1f/51190354458.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0667b5fa---14782397282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=telecaster+deluxe+body+dimensionsPDF 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_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 18312 bytes
SHA-256: 9de41f3bf74d3ed8a737259b45b08e0d638d365f0fb3058eaaf146367010af7f
font_01_sfnt_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 10948 bytes
SHA-256: 0fc2cc484fa79074453e3434d783f65abefcb9db61b75ff1d114649b698a2298
font_02_sfnt_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1