Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadbe6e50a54cb9f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 06:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 603c2a84f6f2d226deac4ab328fce3bf SHA-1: 60c045b982fb4cab9c6e3cc1c405a3171db003ab SHA-256: aadbe6e50a54cb9f796f4dbb63e0ec601c24d9329c61efd9163e0b6832eddcd9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's purpose is to lure users into clicking these links, which are themselves IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2881f49a1a26040e02aa56642700afd8/44470375234.pdf In PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/89544268268.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/86763273556.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/xezokanogozalazunabixuzat.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/rekiruri.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161191dd3de246---75009661586.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/suwobukosivivaxulawatunov.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112a1e55b5c0---1452591765.pdfIn PDF document text
    • https://nicosiacaffe.it/file/bonojipidobizejurelofew.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160871d27c5766---tabipemotenisene.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/86899643737.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb0730688---pamenavopek.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/n4e488baft839qlaqebqt2b1ue/76893659830.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/8375591093.pdfIn PDF document text
    • http://terminsk.by/pics/files/karetu.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/waruko.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/90062976461.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1a364d31d---vogasezim.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/fowapasirewuzumonut.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/1295230616.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/41650191804.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hd92b1ir918i8181jsf4vno0ne/peluki.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/11842568008.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/xunevidase.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qs89fe08lqj2lr80u581b331hc/54892939687.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/16d4ba5e51492c897405776e71180cd2/fagedaboxuziwowoxagulax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=encyclopedia+of+social+and+cultural+anthropology+pdfPDF 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_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 18776 bytes
SHA-256: 32ffebc354b0c0b0f81a1396e25c6d9f7f4b9f1feb8ca8f2ed26d3e19ec19b19
font_02_sfnt_off00013115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13115 11096 bytes
SHA-256: 6ab53aac1e4aff1bc7c589cc245a31d10dfa19161452dcd08d61075508fc0fb3