Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc57c1f96d96eb24…

MALICIOUS

PDF

123.5 KB Created: 2021-09-19 17:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b24a70fc4793429e738339504a546586 SHA-1: 35b9a8fe0c30bb02627b360036962b613ec7aa2c SHA-256: cc57c1f96d96eb2450c6423f2ba0ec9e834e7f6ce76433cfbc7d8afa9ec11633
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://tedvandergulik.nl/userimages/file/28669014483.pdf In PDF document text
    • http://wronba.com/uploads/wysiwyg/file/56060410338.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/berazumovogufub.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3e17227649883a830349ad6a50c64af3/zitijagovu.pdfIn PDF document text
    • http://mweb.cz/images/file/70386518125.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/91717808124.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/66744550321.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/75918778647.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/88531282020.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36204028e---dezovuwuleno.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/ropopodaxodaperewuwil.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/rofujotulinoxipiral.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613710d085ccb---wudisawow.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/97647579043.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/96977171391.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/zimavovig.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/fenobefinatugisi.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/wokolozepu.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/womuwubusozejunido.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/wexujajibuvifesaveso.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/sikagepekore.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161429c95b141a---xinujajafogesaperigenen.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/34294798122.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/18298963461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=index+of+inhumans+season+2PDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/55495166498.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_off00017bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BCB 10648 bytes
SHA-256: 1a4bc3bd86213bdfcffa426a237667e1691fa6015180f6d88a6aa7ac8ac6adbc
font_01_sfnt_off0001940b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1940B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ac1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC1D 19224 bytes
SHA-256: f8ea4ef2360fe5733908a5f3b3891b702e4c61d7dd50139606da7b95c67eaf2a