Malicious PDF — malware analysis report

Static analysis result for SHA-256 99734dbc75fb1945…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 23:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e62b04ba196989ac5bde805d6dd4abae SHA-1: 3e38bbb2e5a672ff186f029ca9773409f8d43424 SHA-256: 99734dbc75fb194573a32e4cc040910d22d84d58bff7ef09e1d3cde311fb570d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://archism.ru/uplcv?utm_term=html+form+to+pdf+source+code PDF link annotation
    • https://jpjplumbingandheating.com/FCKeditor/file/bakenaletimugad.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///39017275723.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e9e53e53e---2394128827.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16073618585e94---42271757660.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/zanupexaforaj.pdfIn PDF document text
    • https://filetorme.com/upload/files/69282421241.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5e718838b4515e6ea793b38e4419cb0e/76499412852.pdfIn PDF document text
    • https://palet-school.com/files/files/88145103039.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/kujedimirenopulibomaxadid.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/xotimigimejori.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/kogataxodegolotemi.pdfIn PDF document text
    • http://apsons.eu/files/file/89624740549.pdfIn PDF document text
    • https://chptravel.ir/data/file/65661588112.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8941e61dd3---4332390900.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/98679142800.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9f05a65271007d3a2ed4d14b9ba03c55/jipusam.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/fovefebepixum.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/bidison.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/texojufawit.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/pafawumapipab.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0db441f2e047cbba6d6a71dbf837c179/zovininebodujo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f5273a52161---48084299048.pdfIn PDF document text
    • https://ikima.fr/uploads/file/29011827459.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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 23532 bytes
SHA-256: f3c76b291ba18ef8d3e60d995b920904c1f3f45d24d36c0c8a621400a523ef15
font_01_sfnt_off00011cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 10512 bytes
SHA-256: 5b56009654a02419293f60e67f07eeb09f29254b2399f17c260cf9a363aa608e
font_02_sfnt_off000134e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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