Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecbe770af9dc572…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 21:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae638bf99e3a7b1ec3739bba2a07205a SHA-1: 7128a5b791beaeadd6692a38db6838550b505235 SHA-256: 0ecbe770af9dc572209442d787c396a41221392a1ae056b0108bfee2330d1aaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs further indicates a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=modals+multiple+choice+test+pdf PDF link annotation
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/6946389850.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132af83f365c---wedibuline.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109091011211369.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/532a768da3ff0b3871f9eac57becb474/78243200852.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/kanataluku.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/30834919533.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210902104503.pdfIn PDF document text
    • http://htwy.com/upload/file/wenasoseguwuzitujunasunuf.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/53595752895.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/59465439586.pdfIn PDF document text
    • http://i-dron.cz/data/file/fegalezibojujananiwoxemob.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/retizibogonuwatizujizip.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/mogagate.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/kuzazapugexudipumijat.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c91a715315---zawivomobezaneje.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/23916419843.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/8902105494.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/96819861901.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/15613737732.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/74879072792.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fjvrhm8e9vde7js8f8fp55p0n0/52929289831.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/gufira.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_off0000c22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22E 17052 bytes
SHA-256: 6eece1818b28da6f0ee4b360debdfee3b2fa560f2082421d402b88062223c56d
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 10772 bytes
SHA-256: c49ce99811735f609ef5cea33b0d31a1010dda4f79bb8eb47f83a70d4eb7d425