Malicious PDF — malware analysis report

Static analysis result for SHA-256 629319fa2fca9868…

MALICIOUS

PDF

102.0 KB Created: 2021-08-08 14:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de5893253fbc97702dbee2f95ee642fd SHA-1: d31fc06173eb26adb4ee28c81b82ef2c4f772574 SHA-256: 629319fa2fca98685931c2a05d8be568c1a030cfdb3c2a5536a8a61f62860ea8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the document is part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e9f5a4548---73005305468.pdf In PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/66786344854.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1abc5ee90b---33856315059.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c3e02231d7f61c808b8a8cee4569efd8/42430024285.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/55ca337caeffe3ab62459c6f92d42cec/61305177616.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/nolosajavomifid.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/firefuvivujozunokik.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/68150806377.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b8f2d47a1---vekavevimadulurodizi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8d1a4fd9f---70976989473.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/kulup.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc48435b467---mokanomifuk.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/nadenebadawamegurur.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tejepevaxarife.pdfIn PDF document text
    • https://corghialberti.it/file/sesaxo.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5036f35e---12815700323.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4b73f0775157fd0390217a822d35bae4/40769071610.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-11/20210511095636164097.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/6ff5d6097fd1830cb2977429a94b96ab/pekojamagabivogasuxa.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/4837407030.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810f4244dc0---wuvakixam.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/xewonojitupofedam.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/zobov.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/87919537502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=is+it+bad+to+eat+every+other+dayPDF 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_off00012d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 16576 bytes
SHA-256: ae0cff2a91806ffe25e512867fa21b0e4b1ea63649a08a52f4e3d2ff046d7160
font_01_sfnt_off00015821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15821 10464 bytes
SHA-256: 4f865542d6a0e220159444971a2b626a353d96f1ce030ebfc41e82a5f2d0973e
font_02_sfnt_off00017015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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