Malicious PDF — malware analysis report

Static analysis result for SHA-256 1072a945df7123a3…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 20:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23516ef2ac1fd516c75eaeb4b6003ee4 SHA-1: 772d35cffe96c00880e2a03706166935547de491 SHA-256: 1072a945df7123a3c3f1c27428d634a79b9fa8cc78fd26d0693abd23c462356b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://queure.ru/uplcv?utm_term=talend+open+studio+for+big+data+user+guide+pdf PDF link annotation
    • http://atenngo.com/admin/sites/site/documents/43652342078.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad00af732da---56228394677.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/19b904548589f9d08637d7eb5d49155a/lozobamixilewu.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/24790219603.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/rakigugajeda.pdfIn PDF document text
    • http://goref.ru/files/file/tirimikimipavalexape.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/1fc641cf1be0efa0ae25eafac3b1ec35/rolekazenerajibetowij.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///ponexesabamoxedo.pdfIn PDF document text
    • https://wsbtitan.com/images/file/40417856889.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a7c9f77a8a19898d129eda7eb2ea1fca/simikesitot.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/najopimokiditapusakale.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/22961400206.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/zovar.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/melumedokojisebo.pdfIn PDF document text
    • http://keramann.ru/uploads/files/4155593273.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lilix.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/53648954317.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/99504896628.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/josat.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/2248116915.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/73361171852341b09ef04a7e7cf0f802/texedezozu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac29f9ba05b---gujakewozot.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_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 10876 bytes
SHA-256: e55a30741db33e2fc7cd84f5526efc732ec45783c1a37520a9d3e2ea03eadf3b
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 17340 bytes
SHA-256: fc14f65570cb250787bb250ad95a6c7452cb43253ce10ca17cbc0b670c99e418
font_02_sfnt_off00013044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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