Malicious PDF — malware analysis report

Static analysis result for SHA-256 1853370d40d78c0a…

MALICIOUS

PDF

84.8 KB Created: 2021-07-23 22:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41dba0106c1e6eb6623a6942daa7f7e5 SHA-1: f2d12220c959c50ff8a597937a90d5496b2ce4ea SHA-256: 1853370d40d78c0a26611fc8f364daa5d89a4b6b522c47803fe716d46e891c19
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs hosted on compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7802e569---zavolodo.pdf In PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a9c8de82eb21b66401409dcc3ba41608/59687177944.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a1f49c1c---19592135250.pdfIn PDF document text
    • https://ambalatender.com/upload/files/gekimolut.pdfIn PDF document text
    • http://change4best.ru/upload/file/kokukaxuvedabalofiwiri.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/nulilixuwonivavijiwiw.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/giwudopokizi.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/37190118334.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/6570370988.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e4e8197ab037f3a518c088c5ca0afd99/kidepamuretosiva.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/35136247592.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/54617008352.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607120c63dc7f---megopegofogek.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160736a5d07258---zenowezipovubibaxu.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/jalajaw.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608501d95eca8---xupogizunopusulosodamot.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608d382c8d102---xedifukexufewufukuxuto.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/32e6e68586b491d83c1b0fbd86b7a3bc/jinoxudetagi.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/gisuzu.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/pekoginew.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/34986699024.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a28bfcb235b---53853015634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=talentos+ocultos+pelicula+online+subtituladaPDF 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_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 17348 bytes
SHA-256: c8128b089a69c390a60b4499bbeca2352360553d63181e2aa81592a5660ca70d
font_01_sfnt_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 10612 bytes
SHA-256: 82d1950c0e52a4733f1a2d2eee103ac69d5e55db3f59c3304b2883ae92fd55ca
font_02_sfnt_off00012b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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