Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d668dc768cfe5df…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 18:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61c3bd0d963104ad4f950af14a35dfcc SHA-1: c142753ac5122ab0aaddd044476122f2b89b97ff SHA-256: 2d668dc768cfe5dfc80c9cd420a8efc300a1710f40c0b47dfba99c1d4bcc344b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, with many URLs pointing to compromised CMS uploads, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest it is designed to redirect users to malicious content, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096100926ac6---85136883311.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/4cd8ee9575e88c9dd43d42fb86977d2d/74070139809.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1455d3563c1d89943d002744eb8658ba/zepidetosanu.pdf
    • https://widepolymers.com/userfiles/file/7198972344.pdf
    • https://akapacha.com/userfiles/file/9504684313.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9f00520a---86454944971.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160750d774bb1a---7241596507.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/e44jqsdl8brtnusj1ju02780cm/xajuruzibaxabusebelugi.pdf
    • https://khabul.mn/mmpa/userfiles/files/jokufibapizikubuja.pdf
    • http://antifftech.com/uploadfile/file///2021050813594720.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48efbc2d76---dexaxupavevulo.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609b878a26306---27532968300.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/cnlh9plrqrs71errvje53c2rmm/mavigujere.pdf
    • http://chiengthai.com/file_media/file_image/file/60083355225.pdf
    • http://martonaroniskola.net/userfiles/file/69036068484.pdf
    • https://beytarimcilik.com/admin/editor_resim/file/kozivonojalutipotori.pdf
    • http://candientushinko.com/images/file/65273818453.pdf
    • https://24emk.ru/ckfinder/userfiles/files/devavuno.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778148af0a1---vomitalulaxofa.pdf
    • http://ipost.mn/ckfinder/userfiles/files/vujumogitowotum.pdf
    • http://www.medicellbank.com/userfiles/files/repajeje.pdf
    • http://amandamaitland.com/images/file/jukarizeraw.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ddd4d3ac461d3c5a3b2b9494db94b1b9/74368991268.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd9a666958a84d78f19766c75ab63d1a/lanusi.pdf
    • http://sns-russia.ru/userfiles/file/birozenuvux.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vhom4krii88b9e0l51jp761q23/97971042056.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=palace+hotel+durres
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f015.bin
28bee8143a265d4cebfc6282a7423a78341d9fb12479e8f9f7df68bc16dc812f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 24924 bytes
font_01_sfnt_off00012a29.bin
3f4a45e9c9c0a156df3ab24aeb164756968114a05866d859a8852e458551c63a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 10372 bytes
font_02_sfnt_off000141d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141D3 16792 bytes