Malicious PDF — malware analysis report

Static analysis result for SHA-256 4694cabcde49a451…

MALICIOUS

PDF

70.9 KB Created: 2021-09-05 20:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ae99ab5ff26e5917a1995d9617996532 SHA-1: 54b758682c6455ab33f4f4448f69ffa420233487 SHA-256: 4694cabcde49a45138050973cce9766fdbe0b1adbded91db1d34db17fd6775ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identify it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute further malicious content. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the overall structure points towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://fullcolorspandoeken.nl/userfiles/file/roboxek.pdf In PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/zinulufafarevini.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/isqouqs7guq09fk1put8jmoq03/suzoduzilunofufoterir.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a261e51581---mogobimapazodozodotokove.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/xekubarup.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072f0325c5a5---25279123915.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f08c9274d---79880333542.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/214f5148f206dcc01b829a2bbbc76d6c/xepatigasigidow.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609263223ab0f---89881003922.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/22454057117.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/lipemipubizis.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/womupazipipewavalaguk.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/82779504161.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/16032769408.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/vudanubunitutuji.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d10f229c8507773c95ef11043aa8866a/99466145701.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/j2b4pjtorkb9q4qpf2ph3p6mah/83857999732.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/49949907123.pdfIn PDF document text
    • https://arendic.cl/files/11727490275.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071197a76df2---piroluvubibi.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/rifiwaferosado.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sirebonilawomedu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a086afb524a---laxuravud.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/47904569e919a71925cdb04474bcba6e/3251348943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=archviz+portfolio+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76F 10256 bytes
SHA-256: ea9cb4c9e29566412a9cf18eb726491f17378cecc86ef619b68f47f4cc694641
font_01_sfnt_off0000cea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 15748 bytes
SHA-256: dee207a86c5fc0c89fffea812e587fcdb629cb8d28dff139ea9b1bd94fb39e89