Malicious PDF — malware analysis report

Static analysis result for SHA-256 07419f83bb2b1c4f…

MALICIOUS

PDF

84.9 KB Created: 2021-06-25 18:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 82457725f795d8dfaccaf4435c9d70b0 SHA-1: b3fa849c442879707acd067966c1e0206ac74817 SHA-256: 07419f83bb2b1c4f6e518990443e30fcc5b49da4e155a8a3aeb2119e110246f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=enjoy+your+day+to+the+fullest+meaning PDF link annotation
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5hteelthl4n8uqqimt314c057t/37540962058.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/94012053693.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cd29460cae8---91401743589.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/15749802598.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9467666dbe5a6e2a92ac6ec03482b02e/29779457851.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/658668349c7d8e7d29ea79829ccbfeb3/panuridivem.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/kavazapibenadatedavu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cjd0lrat62t2891jklntfn8df1/bisud.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075176ba3d1a---wotofagubebaxemakif.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ni1pjs42ha206kuegh0j67i91t/91219104579.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092de68bed6b---58511282531.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b46102b7df5497bf39c471d689173b33/47922183917.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/44645187731.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/36542998150.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/1335636340.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/94028654393.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/daf0d7aad6505b7e08926bef279066f5/fulixivukosipapedid.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/5113241054.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c8acfd5e04dff7fd06b1d882c35b463c/60351466269.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/31078943557.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/p8jssqg517vnd93bi4v0apnsk5/86855268481.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/p9hmrn24kbn2vceecp7tt8uk34/bagovopixuzebitawu.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_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 11128 bytes
SHA-256: e4af90b9327b40c7770520833f09a7dcdc611ecc395d8bc57f4271dd18337bfc
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 18512 bytes
SHA-256: 48e283b5d3db2435aba0b3a946418bc1923213dbfb0f1ecce4f629c50edc9ca6
font_02_sfnt_off00012e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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