Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc932658ac7eeda…

MALICIOUS

PDF

79.4 KB Created: 2021-06-29 06:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ffcdc4f3d8807ce5d1137824a7c14cbf SHA-1: 17949e5dc318582b0385d569ddeb2b8aae448948 SHA-256: cbc932658ac7eeda2e9cd265f4f9bd4abde8e2bc942f58a79c403d182c5e904b
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to external resources, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick the user into downloading a secondary payload disguised as a document. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7772a606d06539e2083b0b1121b549e4/366161965.pdf In PDF document text
    • http://eko-inwest.eu/upload/file/rumikemosodumivutozilow.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/zutetovo.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/libakibuvorupazuzivezim.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dda29b835---sasir.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bd3025e80---49750845660.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/wuralifew.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/10951872167.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xifetilixirose.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/23868926505.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca67eb2a78---medoxoviletowisitinuze.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/19905958080.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/21268135250.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/f4o6qqfghr7u05buoitmd29684/disagubatugi.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160854254d6a77---roloxat.pdfIn PDF document text
    • http://msiutilities.biz/documents/vesiriwotisagopi.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/fofopal.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b875305f28e---zawawejeriziruga.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/85447908627.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f0676cc8602abf0b8b09084fa1c10b0d/xisivewave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=2015+geometry+student+edition+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 11180 bytes
SHA-256: bb2c6ba2fb2f64b30b603143d7f08dcc1da255107f0f6f394f192b3cf7e6f9f4
font_02_sfnt_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 16084 bytes
SHA-256: a79c9caf7d9fe7d7e6557dd08284a48a0650ee9668136fadcfdab94fba17ddb2
font_03_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 16860 bytes
SHA-256: b7eeda7aa70cf599900b22c9bf841c449174301bb59c9db956285bf0aabf953c

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