Malicious PDF — malware analysis report

Static analysis result for SHA-256 504faf24855bca72…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 16:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3932d45bb985c80b8fa993c02d299d2 SHA-1: 4ee92134e38db93f9656c375e647d10450d80fb4 SHA-256: 504faf24855bca7254719ac6e5f8121fecc19c26ff2c7fc4de28135d76a49d3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

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 http://3wsystems.com/shipinc/userfiles/files/xanazofuvebejexesegup.pdf In PDF document text
    • https://toocapen.com/files/vedeguvamutokipamixepo.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/vasajonog.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/61515348612.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/walubefoz.pdfIn PDF document text
    • http://thaide.org/userfiles/file/muxipojakazun.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebee9b2b99---80159818694.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/80367618006.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210911063105.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ovr08j4i1k4pg8ndjtueuhtbv4/21899779644.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/wevixiluwu.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/noworovefivi.pdfIn PDF document text
    • https://anesaportugal.org/upload/file/lurixemoragolajitugamifig.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/141b39cb337f29e4162b94ab73dab1f9/61010040364.pdfIn PDF document text
    • http://www.heksan.com.pl/file/dodowuvale.pdfIn PDF document text
    • https://premiersuli.hu/files/files/25514784372.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/goruvigibuvov.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135baa7a3d20---notinijutuvawoxeke.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/47332843807.pdfIn PDF document text
    • https://akconta.com/uploads/files/kisakogerekozafopala.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/2095795290.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/43424795982.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/95667223809.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8c1c3ee9---73325936548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dls+mod+iosPDF 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_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 17824 bytes
SHA-256: f1d7775833d0d4550480a6534d0c1c474db713eb92e4c01fb84a456ecc9c7a60
font_01_sfnt_off0001181f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181F 9812 bytes
SHA-256: cb1eaf1f28d454c2c0633ddc68a7367ab24f85d6750736f8d2b982755b71c7b3
font_02_sfnt_off00012d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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