Malicious PDF — malware analysis report

Static analysis result for SHA-256 037c89a97c9ae9ae…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 18:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91f98ae1936cb998db2e604a65588f11 SHA-1: 92eab271a8c48c1bcc7f83ffa13c1ffe5cff6320 SHA-256: 037c89a97c9ae9aee3b2f41022d7269ab8f583ad6546afd9c5a3c20893ac2107
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious or compromised content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cribpointonline.org/cribpointonline/userimages/file/40758895629.pdf In PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fade5d9c35---19530598746.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161002c5a5afa7---xiferidej.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161132f346ca0d---91106411060.pdfIn PDF document text
    • https://people11people.gr/uploads/File/kuximewedofomaz.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/narumamewunopojewufoxow.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def7d05b00f---53436306293.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a40c36ba4a5---1744630805.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/dovuvofabajopigit.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/tabomewufe.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/duwatoseguvotejafajorijik.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/zanojezodalixizamefora.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6e28610a5a8543c226672737b60ff544/nibimopotadu.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/nosegomefabigomipor.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c69410905---falidarafepipu.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/34269930945.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/mitoketenetasokixik.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/bejudomilazugoriwa.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/76556861252.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/rapijumageji.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c338dd18441---77337609436.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/84408235690.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/99908408615.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947edbc7154---munedutotevofasik.pdfIn PDF document text
    • http://poorclarescork.ie/images/xezipal.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/68547536921.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/4sh4iuvgdngvhq16d3badfkc7p/57281610072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=inequalities+worksheet+with+answers+6th+gradePDF 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_off0000bdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB4 17396 bytes
SHA-256: 607472a2da54729a758ce32aa92d2b1348ac5ff174ce878bb52eb947380cba85
font_01_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 11072 bytes
SHA-256: f70c4ac24b8b8486e346cb67798bc78d2e51fc71bf1b1686195ace2839dc7f8e
font_02_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1