Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5204c5e91e1ddc…

MALICIOUS

PDF

75.8 KB Created: 2021-08-28 06:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00a9790b0fbf4e78249d8a61502e125f SHA-1: 6fe761ea4a09fa30a5ecaa68feb9ca776674f2bf SHA-256: 4b5204c5e91e1ddc6c92e594951bee49de602ab6249068ae99b3e7a10e6ce407
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially harmful content.

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 http://danieldesignpro.com/userfiles/kimatiloribupuzus.pdf In PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/33588644695.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4cf3bf439---34488330823.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/gurifoxirisiwaxowive.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e48986c75f---webifomab.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/jujawunerev.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab18dca6cb9---lavigexik.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/19316997740.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/sudekotuvovibemikisus.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/21588802556.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/zarubijorulukutagituzamif.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/3377419188.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160960ef5afe61---13006033038.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2abeca66c---11517043321.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/19883cd1933d4d3705834a193549598b/17108932716.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/k19fabsvr4k1cps3sgn4jresi6/43376429935.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/q6rrvipql7gb5pqqgrvbkc6okc/19255911112.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b38947d8---lofomajukoruwor.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/zedobozapebonopazasaruf.pdfIn PDF document text
    • http://padgettlawreunion.com/clients/79772/File/11543741926.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/nagiforagetorawadup.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/73184921095.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160888bbef0b67---59237934977.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/pedeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=thaw+in+tagalogPDF 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_off0000c60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60B 17284 bytes
SHA-256: f51fc8c8836fb525ae28b79b1e465f225969afbb2b597e4528f7352f0877fb28
font_01_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 10036 bytes
SHA-256: 3bf00696e177140a1c10134dd2ebf593495d40c6852ba5f1d06a8eba29b60098
font_02_sfnt_off00010989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1