Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bc8c605ff452a6…

MALICIOUS

PDF

70.6 KB Created: 2021-05-01 23:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 648591a4f315611dbce0dd8edda0c0c5 SHA-1: 23ddb74d3eaf776436ca9c08fab3d09b93968a0b SHA-256: f3bc8c605ff452a6290049779c62d7a6d92a3b86541147f16bc44d209b72b23e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3cd49861302eb411de042e19367638d9/18671899481.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750734afa74---vemeboxixupamidupoxan.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e41a8a64a---romorinuzegedutalagesi.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a5fa70ec---35641500957.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805ba757c10---dupomit.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/jgsk0vqmuevfm7bnatam4a1ahl/14330175738.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073312bcc63d---83000515278.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/739f82ee87f0286e8689e281a51b7c91/melugujamumibudo.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160833ad4b1b32---69518093021.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f1ba400b---14289415990.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5331c73c---doraz.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851040a99b1---22625367815.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/aff7fe63f9981e081397dc2ac826a3fe/janoxolujojetutitud.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc9d68882---simufakamewofo.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/vtggo5d0fit0pah7aqsdalo0v0/68825329180.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b8884cb56fc115d5263ede13855d1c99/ribotilosupuropisola.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bachna+ae+haseeno+full+movie++ganduworld
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69e.bin
48bb9931bc351b2e61b5f3060817fc824f367ae197e0a5fb2c04f74b5be79c94
pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 5636 bytes
font_01_sfnt_off0000e9bf.bin
b2ab82bf251ad07f3ca70bfda12341089f544c645ef3dbe8ec13ce776307609f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 10476 bytes