Malicious PDF — malware analysis report

Static analysis result for SHA-256 850ccdf2eb51813c…

MALICIOUS

PDF

91.4 KB Created: 2021-09-01 13:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 02d600b1eeb2863577c7b6b5c500682c SHA-1: 3228e8a2eda819736d6f567348e1741ba06535c8 SHA-256: 850ccdf2eb51813c25f0dc3da209640bd4e18f60df7ba5991e7a4269b3598002
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external PDFs hosted on compromised websites and disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of PDF link farms and compromised CMS uploads indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://antae.be/app/webroot/uploads/file/91955484188.pdf In PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/litawaxuxofitov.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608490caf1e89---59639798280.pdfIn PDF document text
    • http://sin-hua.org/userfiles/52301677651.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495be414d5---zonunavipaderuf.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/u0e7r8s1sfc75p6mmnnaslr974/59940561331.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b9802d51---55489314071.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/65ec9725422f7ab3b221261eea293e63/bitopuvis.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bdc631b645---luvefoburifeguralebiri.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5b33859b---febebisi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/60794793022.pdfIn PDF document text
    • https://tpk-m.ru/files/file/wibakidageti.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b80a328003---88166812304.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a0c6cedf0---21026490942.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b91de015820da614e6c74b88f2bef714/zudotuganolawub.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/debavifezer.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/70094568427.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/gomutipasagilegakapi.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/zenima.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa593a3e104---wofonomadudejuzobigajiron.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/naselajofobavekevatidof.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6bae35e8---93022109737.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/g915op36tp7f3k9eaavegn5l10/wepimojawuwapizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tolkien+history+of+middle+earth+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://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_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001149e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 10932 bytes
SHA-256: 9f50acf2f258b3d628be388bd423881a14e845b7280422c3663edfb4e754f58c
font_02_sfnt_off00012dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCD 19132 bytes
SHA-256: d5699c6e7b6126d1cc3542520f9ab82f418a24988292289ce84b8d27e8465517

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