Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8b1707ffcb33b2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 13:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0642874ae1508a508a4a1982bd5a13e1 SHA-1: db3a7a3cea3a3f8d2b195dedda1368046fe8ca12 SHA-256: 7f8b1707ffcb33b2aa5de30716d85a9ffb18f2cdca4678708188be9a08fc6912
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised CMS uploads or disposable hosting. While no scripts were directly extracted, the nature of the links suggests an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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 http://pileshoppen.dk/userfiles/file/12564513372.pdf In PDF document text
    • http://alliance-ltd.com/userfiles/60741683919.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/05k89n2oj7m9951kl49tehtti0/dowubere.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/38086247086c39ebb0920b3625331073/75256630373.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/df8fee99d6dd476ab2f425af86d18acd/19943056209.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610d52ed33252---36760435121.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ecd03670---ligid.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3dcc885a6---rexajisikagilipevisixug.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/24191194845.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/74736745425.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/90989591583.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/39281642363.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/nugitonize.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/95288029694.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/dubil.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zopuzasiregivoguxati.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/21123902254.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611cb35172655---10241433846.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/q9itqlatn4l5e5dkq5ivcd66vq/dadawakobafuwon.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/vesivapolepatapivasomi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pc93cepfrhnadd25t7hmg85hv2/pikole.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/80468281398.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f6bdb557---kisaxotojeropitaneb.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/zarazavosavupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=geometria+y+trigonometria+libros+pdfPDF 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://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_off0000ccb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB9 11132 bytes
SHA-256: e254d4ad1fa77e40e80783a1acd712db6c0f4104aa2fe9cf5ac0b1c99963c5ba
font_01_sfnt_off0000e657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 19488 bytes
SHA-256: e3191428b96aecd11ea6e1de1423eb1f06ff87965178a7e211ea2dfba955b57a

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