Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3a88568f70e26d…

MALICIOUS

PDF

93.8 KB Created: 2021-08-12 07:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91bd6a9f691336ebc703c978e8bcd040 SHA-1: 02ecbc5643c4c560475648f06922a94ee88459b6 SHA-256: 3a3a88568f70e26df932f2dbb890da882914c366a24040a3d08697786a2f776e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to multiple compromised WordPress upload directories, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content hosted on these compromised sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160879cd734933---zupibarekomefuvu.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb89fc094f8---soxawidajomafatujiwu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b996a8a6a933046ea04f80990f43be6d/wipulef.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d621b01038bc35a7d14d25ac51f01a7a/29289329557.pdfIn PDF document text
    • http://metall-press.ru/files/1163930998.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d406f9d8b39---56982796195.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b404b5ce9---bofafefuxopureganajaw.pdfIn PDF document text
    • https://norservis.com/files/files/reparimokamegelezigame.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/redujog.pdfIn PDF document text
    • http://mobilenmr.com/files/files/10736562271.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dbe1b2235---vukowiwexefodoladusuzako.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/31880278043.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b87fc91daa6---nulexasuvukakasamakov.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/fuborekosudowon.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/febazotir.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/17725686376.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/nujikut.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/0vhub5r5qoi33stg07r5jbclrd/87136661325.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/32200931369.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/50822249162.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/96285995727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=do+you+capitalize+high+school+in+a+sentencePDF 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_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 10828 bytes
SHA-256: 6f1cef702865f7cd73d77c3020f69ac592c6da129661fad600284ba412c8e3da
font_01_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 17916 bytes
SHA-256: 9d432800c85b54e54504cdf992edfb8b9e875aa0118a1d7bff8e9351e4cc7829
font_02_sfnt_off00015085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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