Malicious PDF — malware analysis report

Static analysis result for SHA-256 315fe5b12820ebbd…

MALICIOUS

PDF

83.8 KB Created: 2021-08-29 20:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45ca277c352fab25a1a4a446dae36ee2 SHA-1: d9750f60f190c9edb58a4e3f42817dae181b7ff8 SHA-256: 315fe5b12820ebbd767cb8f1432b8b99dd7665291041a7070bd73d2e912e2860
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and multiple links to external PDFs hosted on compromised websites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into providing a password for an archive, a common tactic for evading gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088348895f6b---94796039859.pdf In PDF document text
    • http://shiinamotors.com/js/upload/files/teboxizeli.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93399283977.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/v92oi3kc798slbbuhe6p1iq9di/daxemumibe.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a37a24719---forolajarad.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160e8755854916---logavozib.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6adb83c446af41a5dd2dbda3460e45aa/63077368575.pdfIn PDF document text
    • https://steammining.com/userfiles/file/94981275056.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/8a15e281751a82466bbaff76f16477b6/miporimebizujo.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/fdnj7njl9ftjemms5lo548u2o5/sirariwizokikatobugif.pdfIn PDF document text
    • http://ruresept.ru/files/file/62073154477.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed1a0dcdde8---77243588338.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfba920a06---49858752743.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ab5af76e39cb7c9818126295d0b06955/45259956638.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/jopipefavufuxudav.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/gamefaseteb.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da33892651---44938827954.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/42832175335.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/kazisubevokazubixawid.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9398658e36b8914280ca1263a5a73b33/mawivupaxufoxosasovuja.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/lexuvofalesavonabim.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061014472735.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/xujivifajabedutu.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/penewefatukem.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04dd20a182---16129279284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dc+superhero+girls+awesome+aunt+antiopePDF 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_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 18172 bytes
SHA-256: 8f7394f07502ac30147082ac76f42c50bf395a26293c90cb217bfcd20bc022ad
font_01_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 11008 bytes
SHA-256: 771fad6dcb9ae369ce75eee956459a2115c915a1e2f2b389cf9d9fab99e1ba4d
font_02_sfnt_off0001295c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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