Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf060aa2272cfb7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 05:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d95cc78834ab5a8206e97f76328390f2 SHA-1: f45b7106f97dcc15ed2c47a1397150a4f24267c2 SHA-256: bcf060aa2272cfb77139efa0a04097729204d143f89aca5ff49ef6311a4158bf
176 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, likely for phishing or further malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pixomot.ru/uplcv?utm_term=backup+list+of+apps+android PDF link annotation
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145404b39465---77561838573.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/20889920273.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/nisig.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sabopifi.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/19291854870.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/gisaziwegexosafa.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451795648d3---sejaxokedatenidep.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/7582773381.pdfIn PDF document text
    • http://client.diffuse.info/files/vevovo.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/jeriwaxavuju.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/319e947f192b360f460f8b0f05608a2f/wofifufawobupizixituram.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/gimowogujibinuj.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16132c41c3a706---94731562666.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/debij.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210912005336.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/30562328942.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/resiluzilopewurimidarox.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/mawalubid.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/gagixinajakof.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/45120965823.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/13823762404.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/46868652677.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/zolalopetomu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f7082be39---18559600494.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_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 17292 bytes
SHA-256: 5c38a8b6254f0419a109e3704fbc9788d6bb3ce0fa37f2a776b87d5da1b2b194
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 10724 bytes
SHA-256: 55627a32225709d99a11041f7d822299c2737963d678f144e21ae91875d1f382

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