Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff95d7dddb1a2f65…

MALICIOUS

PDF

85.8 KB Created: 2021-08-08 10:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94927dfb1cac0b2b3ec08a2612d42089 SHA-1: c5cac3e79c70ba1c6d41235ae704ce8d17a99c79 SHA-256: ff95d7dddb1a2f6589eb0602e02ef9d72bad52e555ef607e5a756bd00f806dc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to phishing or malware distribution sites, as indicated by the URL structure and the 'link farm' heuristic.

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://allytemp.ru/uplcv?utm_term=philips+respironics+dreamstation+go+cpap+with%2Fheated+humidifier PDF link annotation
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099b52e50b9a---jidejokixaxixafixafaxat.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/zupovi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fe8f7d589---rudagalopijojelakujosukom.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/27860879820.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a0ff46059d20c8d30745153514249cca/xadexopawulo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fc640927f090da219176310693c36f1a/pazuwuwumenejodimexex.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/masiza.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/16008411007.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/19559958546.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/bezedojuguturu.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/53151360251.pdfIn PDF document text
    • http://prestopc.it/upload/file/fudunofupexorigujuko.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0535105572c1b239ca9a9232d3d432ce/47859122332.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/sasugurujukijezovugo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0c4b992f57c91f689f4ddbfea4288c0a/mufusezab.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/62609271227.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/vamoxogetaxebi.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/49830aef8853c892a1578fad414842e7/nuwov.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/1325894009.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/tefaxiwovakuruladokuru.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/kabewezapodiba.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/568b52d1254d5dae6e1bf4b7a9a482d7/kikaviwuvite.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d8234f7b6---gobelaji.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_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 17248 bytes
SHA-256: 0d481d808cf1dc3632ee090379b2c9c3acb27d2f053f935ce259d9108c48521d
font_01_sfnt_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 11288 bytes
SHA-256: 5570e7d7c22faf60e090d7b4f1c54713c11910e5c78b4a19a1164ef453209e32
font_02_sfnt_off00013141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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