Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc72a2a7a67351e8…

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 19:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2405a13884e2b6f2e9cf292d079a9aa SHA-1: f664fba3a377fa666acf5ebf4fd05e72b47a23d7 SHA-256: fc72a2a7a67351e88cee7d3639d3228bc06dac129c4b28d01c67054c6f198fab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm or phishing lure. The presence of multiple external URIs and link farms on potentially compromised infrastructure indicates a strong likelihood of malicious intent, possibly for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b83c73336c---gejinajezutolema.pdf In PDF document text
    • http://gsmontaggi.it/userfiles/files/jetofijulixezapinap.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/pupefer.pdfIn PDF document text
    • http://grupophi.es/uploads/files/3411810521.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/97226394698.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ea363edd8027f28ba1c3ac71afcb7c5d/88251601323.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/xukagudazexevulejetufanib.pdfIn PDF document text
    • http://sun-tes.ru/files/file/nozalenimomimuxutufiteje.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/letalo.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e4b78d72c68e77cce821d5179a50130d/ratitobijajove.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/10580124297.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/p3rmqd2je2foqqe55vnsusun3p/sikika.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/65227380996.pdfIn PDF document text
    • https://schmitz.cz/res/file/bamoviratofefewuzitat.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/nemizo.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/dakix.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/k50r7dsoal1m8beahh1j2l9rpf/32336428627.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/81c255eb1f95b00a9d483069c7865298/mefujerozebiguv.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/92376034120.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a4c0a55eddbbc12a2ed84a65f3e0ad8a/rabujimado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=manual+call+point+replacement+glassPDF 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_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 10808 bytes
SHA-256: 9907369c93018e50c768506accf6c3fd1f82af38faf9dc4f4c89cab268178be4
font_01_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 18596 bytes
SHA-256: fc667ab6efe0e161bd7641509237ede8d046f7f2a3eb874c186f6c7472aa02d2
font_02_sfnt_off0001385a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1