Malicious PDF — malware analysis report

Static analysis result for SHA-256 388e71a4339395b6…

MALICIOUS

PDF

84.9 KB Created: 2021-10-05 13:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3b9b68494347eb1977b6953dba1bec3 SHA-1: 75eb2cf16a46a25cb81c58286db294e00b032a4e SHA-256: 388e71a4339395b67ea6442c4e08432f07a86d7640853f538e5498f2b02e1f18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, with some links pointing to compromised CMS upload storage. The presence of embedded JavaScript further suggests it's designed to execute malicious actions, likely by redirecting users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=don+miguel+ruiz+the+voice+of+knowledge+pdf PDF link annotation
    • https://nieruchomosciturystyczne.eu/files/file/kalifajivoferede.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614211ee890ae---wejame.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/39891532336.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210903174248.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/xinuvovinomisojerukaji.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/86749721374.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/721596830.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210919063349939129.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/53435140044.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/xomafebo.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/takikijozisarojop.pdfIn PDF document text
    • https://online-wums.com/files/files/98251241949.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/42839165500.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/wavuduxorora.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/66853173128.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614167f1ebc75---kaluwakufepidekut.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161470fce3a36d---jekotibedabik.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c936933623---molunudurapamobukivofesi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/sidejezerenudek.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/9608049091.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/komebusujok.pdfIn PDF document text
    • https://flyags.com/editorResources/file///wotoxetumisiratuditodip.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/jebojezanonigar.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/28437856429.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_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 11144 bytes
SHA-256: f4cd2bf138240b2d6bbaabb6463cc3efc39ef3bcbb1284ba212506282ea156e5
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 20236 bytes
SHA-256: 46ec535950f8d66e4f679f7b91b47c34aaad22b47b00b02104e83193af8e76d7
font_02_sfnt_off00012db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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