Malicious PDF — malware analysis report

Static analysis result for SHA-256 9925a0e7a2fe9199…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 18:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c53d04ed4e0f194bf6cc0fa9ee6f0aa2 SHA-1: 293df00c5008181d91c585b46642ee420fd60dbc SHA-256: 9925a0e7a2fe9199ff6abd4869cb7e6c75694b70e71f4f54cca13830ab8daba8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on disposable domains or compromised WordPress sites. This indicates a likely phishing or spam campaign aimed at directing users to potentially malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=localizar+android+desligado PDF link annotation
    • http://ags-sib.ru/ckfinder/userfiles/files/28440177708.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/12836092403.pdfIn PDF document text
    • http://hanifeugur.com/image/files/mojesisawe.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/97928170021.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/82507195052.pdfIn PDF document text
    • https://pixel.bg/img/file/mimewi.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/walofak.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/56926294040.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/kasevefukenebo.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/45892264338.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/33229480306.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce37944e2---ritevedij.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/217742102.pdfIn PDF document text
    • https://sinarwaja.com/account/files/48262245983.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/fabibebejojixo.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/73775568164.pdfIn PDF document text
    • https://gangnampools.com/contents/files/23833575840.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/ralon.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/gejor.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/xopav.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/mezuzatakowowodalasilejip.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/gapumamolij.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613abcedcaf12---19319254448.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/btcs2m4rjkfqcarmoao0daaki0/10063459129.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/rijixeduwelof.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/fegina.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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 10464 bytes
SHA-256: ce40679dfc30659570be6ccc0b18e2352c93cfcba305b4725dda0d36cfc1e572
font_01_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 19176 bytes
SHA-256: 0379e9d7ff5751cbd1b65d33df6fa49a7c47463f59b8b470293bd3a14658a96c
font_02_sfnt_off00011fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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