Malicious PDF — malware analysis report

Static analysis result for SHA-256 3233e396074ae844…

MALICIOUS

PDF

71.9 KB Created: 2021-09-10 15:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2611a21703ed51882fa816a9c52076a SHA-1: 15dcf7d6b50a9180a2c8608c887fbec1a904c105 SHA-256: 3233e396074ae84427734d146b5736c77095143e730f201d7b831d27b0b16c9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e4185d14544d8da7500670b1229e9cb6/2783646611.pdf In PDF document text
    • http://pomocnaukowa.net/Upload/file/visisidepukefuvoranuzemob.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373c1dcc1a8---kovug.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/80222521666.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/bivokudi.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/wolevo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/gemejixuvuno.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/xiwuzujegazazituzulala.pdfIn PDF document text
    • https://ka-base.no/images_students/files/sejazowobezewawilazilas.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/nekasolasovo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae8cbb0e3---59031806596.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/25315962812.pdfIn PDF document text
    • http://qzgj.cn/upload/file/resuno.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/zapitakavoderukafigumus.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/73789051932.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c46470a67---pakatukabagelogeme.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/towanoje.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-6/20210906161224621942.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/gafuvasuxutuxe.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/27554148017.pdfIn PDF document text
    • http://sql110.com/pic/fevejurudalajopamaluvabi.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/39392229120.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/55246233185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=khatarnak+photo+editing+appPDF 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_off0000b3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 17848 bytes
SHA-256: cf1885b5f0f817465bff7368ed6998a936f60f9f05cfc6010ec2b8e7e44fc73e
font_02_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 10540 bytes
SHA-256: 99d7209ff47368eba1ea072b7540bbfa61cb12fa4a28e484e237facccbe4fc57

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