Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b2c24d2d33b2d9…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 18:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce08452bdac8a9a5566c2100a72bb08b SHA-1: 65b08698f5e0165a8da93200dbe2e877ed1f07f2 SHA-256: c3b2c24d2d33b2d98b1eddcec135d483d9c5631c087ee26b51d01cef5ed4d1ea
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://vonschickenconcord.com/uploads/files/18008270193.pdf In PDF document text
    • https://valve-toho.com/userfiles/file/22724356337.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/27074005922.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/40551518119.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60d646009---vawajufesitufegewerokar.pdfIn PDF document text
    • http://zkpower.net/upload/files/72601137040.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/vekotanerololadujenovi.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/gabuzugaxe.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/39383514346.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/flr77kl26jgc83qpchkd79kmg4/lapunetedudasujekesuti.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1caf6a8753f06c50739fa6dfef3be4f7/vojivo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef8d89cf1---82194232500.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/aab01d821ca95f07db75ca3f9cfd0816/fonotunif.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160826350b7981---jiwudegegasemefakan.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/68453bc946925a98633a8d4318a9573b/4129418005.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/7eb3f9da428510e14709cb46ded574a7/59435244249.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/78045935783.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/27509524596.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d882213a98f7c6655c3cf647fa55929c/65596026046.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/40975494527.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/pufalufidepomejorumesok.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160759afc01188---32059733165.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/bakujiwuguvimom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dungeons+and+dragons+pathfinder+player%27s+handbook+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_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 18388 bytes
SHA-256: f87f23778838563e3f2785defcfe4c81a02bbc923c003e22e9c34d7dbda9aff1
font_02_sfnt_off0001331a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331A 11260 bytes
SHA-256: 335dd343238834a8f0b63688d0aef9f13c471b74201095d1e02df97d5bc3c6fb

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