Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca41422eed81d52e…

MALICIOUS

PDF

89.1 KB Created: 2021-06-08 19:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c931b77aaef71d3e7f77e020c0b16d2 SHA-1: dfff50e9140f8f89aaeb9c7717dca609adc91716 SHA-256: ca41422eed81d52e1d61c6432c8c0e8df9fc60e9e008f28cfe03ab33950fb84d
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to potentially compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards the document acting as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://smidgel.ru/uplcv?utm_term=wifi+hacker+simulator+apk
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/1je4sl90evd7nr4mip0ukeitea/26004352866.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1b00e558e13a0c87f3d629a2c461eeba/33583330920.pdf
    • http://allprintusa.com/admin/images/file/83327938666.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16097ea310ae2a---lesas.pdf
    • https://xo-sound.ru/userfiles/file/xegolufejivufolivekoka.pdf
    • http://kbchina.de/upload/79128872615.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f51f02b2392c31a81f69cf2270dd6770/kewuzuxu.pdf
    • http://agendatourvietnam.com/hinhanh/file/najuguxobebebet.pdf
    • https://666666.vn/upload/fck/file/vepisu.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/gujapawunojoporigerinezu.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed47f01ee9---47265787680.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1fc4d491a---23865067693.pdf
    • https://morabia.fi/images/file/75163879728.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3eef4ebc5---10078246774.pdf
    • http://asbufestival.com/uploads/FCK_files/file/18761839162.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hdbpj64ceobta5fs3vvr31b294/tupipujebipomajojun.pdf
    • https://securityguardsupply.org/php/uploads/file/12834999482.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e561.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 6744 bytes
font_01_sfnt_off0000f646.bin
76208394d20310ae419d672682e7e986b1b9dd77d3a3d6f035ca833a2e06ed09
pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 5108 bytes
font_02_sfnt_off000107b2.bin
acff0a9aeece54ddfd225107262f6d01eac8201329a1d657fac21286a884a993
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 4304 bytes
font_03_sfnt_off00011583.bin
929dfe899a4829483568174fb8d3e28b71e47769a031ce0ef60432562a45c8e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 21540 bytes
font_04_sfnt_off000146a9.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x146A9 4324 bytes