Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04637ead5a98e1c…

MALICIOUS

PDF

73.2 KB Created: 2021-09-06 18:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dfbd71a31fb33d0bbcafe8299122b409 SHA-1: ec616fe99763facbd171789969ef9992189fad97 SHA-256: b04637ead5a98e1c88994abc18b0b8457274e463fa2c98b4823d0ad31a17301a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple URLs, some of which are hosted on compromised WordPress sites. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lacasedescaraibes.fr/file/badipapelirimo.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609252e7c19a3---36484601594.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb22e4046e---8677094595.pdfIn PDF document text
    • https://projetovm.com/uploads/files/wigukuvarik.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d04387d322e42a277d770a3961901a52/1925178993.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/soxenedexewedisite.pdfIn PDF document text
    • http://usmleworkout.com/files/file/58132495777.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/dapipudepebiw.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/nakijajezeba.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094d022237cc---7685008584.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/fubunovuvefakugejupadoba.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a285c1bbf28---33021643899.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/bazot.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/dikuwesogituwof.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b571bb3def1---xapadigogufudidoves.pdfIn PDF document text
    • http://congluc.com/upload/files/laxiriwenov.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16198939688204.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/bobedin.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/31867349858.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160890209bbd18---fuwuvalade.pdfIn PDF document text
    • https://digireg.cn/upload/82345185708.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d672f3d88---rexajagizila.pdfIn PDF document text
    • https://tonitomov.com/picture/file/worax.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/paxekuvinefinukiwavek.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16097903a5ae1a---94175440103.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/3316357418.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/wikegezosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=participles+practice+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_off0000bbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC5 10392 bytes
SHA-256: 805d5eed258a17b8721d5749a91c0df7763309d569db75c7a3a40e11e4fb1d8d
font_01_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 17136 bytes
SHA-256: e77fbc84948d962d49c44739b4ff910ab93e5d9ad654a79eb8011c07c94ba77a