Malicious PDF — malware analysis report

Static analysis result for SHA-256 a354a68982c0865e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 02:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57e100f66d39e6da1c8583c958744a63 SHA-1: 7649233cd312d11f9ea0fb2f195589bffaf7c369 SHA-256: a354a68982c0865e54ca7c4f1b4be4054d69903380ce2134ce5c75f9bdd19177
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. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://remobudostol.pl/pliki/jamatabinuxekixofimo.pdf In PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865af877013---13401223402.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782226dbefb---18740662006.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/sobibi.pdfIn PDF document text
    • http://stonebreaker.at/60878911859.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b6eb81f3e670f994546d7c2bc4b7edad/88226580910.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9d7427723831af65f8b79afcd86410cd/56546868615.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/dosov.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/75872909235.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d626916c1---fogetexozulaxadutewib.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/vabaxizobexi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/16a6201559d7aa463f8d7027a3a463e8/82920302345.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/csn4o2etu6r6m7cac1aj8b5qv7/1030551405.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/39mkj7m9bda47cqkdkdrst2vq0/zumatikolezotuwoka.pdfIn PDF document text
    • http://3sdent.com/upload/files/megabifezilulol.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/35783005220.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/gowelaxedeli.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h60alcumincm4i86484ear4o5n/kusomovibiz.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021081318131518.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd8680770b---5952736959.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/55125166506.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0a828e02d55f990a37f33a2718b8bf7a/soxatofidadebegipezenupi.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/kagaralega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=calculus+and+analytic+geometry+by+howard+anton+pdf+free+downloadPDF 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_off0000c0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C2 11536 bytes
SHA-256: 4e2f87b7686659fb8c916af8bf25fedc641b2cdd92b992ef717f550e55ad9093
font_01_sfnt_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 16460 bytes
SHA-256: 6ac1d0e790b4b9f351cf732a2bda75c24ab878c15000330b2abb49d37a2dd7b7
font_02_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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