Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe11ea843ae01551…

MALICIOUS

PDF

75.7 KB Created: 2021-09-21 22:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fe3a281eb98b8d2ff8cbfc0983d2684c SHA-1: ae8651bfd399befbcc4bcd06251f34afc0d8d41f SHA-256: fe11ea843ae01551dd83c2f56a2f6a6cd732623e5105286859dde8fae80c6bfd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting services. The primary goal appears to be redirecting users to external, potentially malicious content, rather than delivering a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://mebelihome.ru/upload_picture/24696659068.pdf In PDF document text
    • https://hkparkkonutlari.com/image/files/giresefeteb.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/27255038782.pdfIn PDF document text
    • http://sissonne.hu/editor_up/vabivifakijilededaf.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463c06a4e9c---vemivogaradizokulitemo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161301b984b27b---beratuzebiduxetotajet.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/75738533591.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613caab7e74df---87287502806.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/wobudutalosafomopefov.pdfIn PDF document text
    • http://allycatering.com/userfiles/dowilekavuxitafedirig.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/biganegesebezuxus.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/nojoxakujuzobiperewolin.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/19733702627.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/palovetuwuj.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/47757204213.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/gewuve.pdfIn PDF document text
    • https://dukupahit.com/contents/files/25950948132.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/8sm7pm8dbm7osinfqv3elhnu87/zufuvotidigivokalixet.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/31999784756.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/82038463996.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/lozugapud.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/22686440757.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/fatanuwituxomulemimimoxex.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/98307835087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=online+integration+calculatorPDF 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_off0000c223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC223 10364 bytes
SHA-256: 3b62329dda8564c37424e1fb76047f434700df976a4079ef64b344a5fe2f3835
font_01_sfnt_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 18072 bytes
SHA-256: 21257ff441555a97e420e2aa5cc86e748271cf914435541c76f0cad1f3f5e015
font_02_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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