Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48e2a07a44962ec…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 20:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c5a7e9883a9dc00e3ac55aa55474b57 SHA-1: da4d34ada42504b386f1128a10bfe7098e5aea28 SHA-256: e48e2a07a44962ec516efdc5906cd64f1696536bd05b013dfdbae21a7cf0fcac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=infection+and+immunity+playfair+pdf PDF link annotation
    • https://balajihighfields.in/userfiles/file/sezoxesukuxagokobera.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210623231223.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/9077804922.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/17223265542.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4c4501cc4cf74a623cb77430f9b44542/noroxur.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/totiwewo.pdfIn PDF document text
    • https://whitesal.com/data/images/file/7386_20210721053230.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d66ac62a35---42536620028.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/48774549477.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/rumepasu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/fefd0b635ae158f88d5d55faaf2334c8/nosefanugezafu.pdfIn PDF document text
    • http://armanetti.com/images/sadukomisagariletixosi.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/32902279912.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e70290f00---wovalegof.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/buwiwalomunaginavipovel.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f1115ab1f04563741832359159ff8948/lojamavitewitizizeze.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/60746119045.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/getodi.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/k611buvd3htqhisn6tklc21tq2/fumofijize.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6g00cdrtlodufgschl5q4amj8h/topedugobikejifabugisun.pdfIn PDF document text
    • http://cjatkinson.com/userimages/gemagakofo.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/99350390620.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/12474340382.pdfIn PDF document text
    • http://jar-ted.pl/file/77627132731.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_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 10780 bytes
SHA-256: ba9093f93c7196fd6b70961d80967e454fb4617e8e53d9bbead4c9133569358d
font_01_sfnt_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 16784 bytes
SHA-256: 21f057b399b68e6958cbe49e5d9166e1bfe202ab6f0ea8d65bfb2c067718318d
font_02_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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