Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e9b18a32a6d5e0…

MALICIOUS

PDF

73.7 KB Created: 2021-06-09 05:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ba47938f77eb9a7226984cd11d94cdc9 SHA-1: 2dc3ae82701c0175909e5465f39997c94bb03735 SHA-256: d3e9b18a32a6d5e00c83a4c5e985d3ecf3e2516227bc9ec9431be5b73148cd8a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing campaign. The presence of 'utm_term' parameters in some URLs indicates tracking for marketing or malicious campaigns. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/uplcv?utm_term=nandini+serial+bangla+channel PDF link annotation
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/bda5026c7d10edb51f036ddcce1c658e/marupimejiligujizenuzok.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/513625758.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc0780295e---mabat.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4196d49cfcc06768ec8b96ae7ee394af/44021415885.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/00cac33dd567f7154dcb4f74f34c6d76/tilulexasarezubulutoriton.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/nafivusedolerelaf.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/ac0cf82e1234f14caeff4dcc575d1049/8180617913.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0bdd82badf03133fe5a92fc7114926f9/25852577076.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/gafof.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/68e0992a3d4e5fb216f8e0f1c73f1646/57556679675.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093a30a3091c---79262913311.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/zerup.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/mom201p4ffiegq5n36bcltkj23/64026502640.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/18e38ff9dd488415320e1ab18a851661/dukagifax.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609575139c080---dimimukedusepumefupim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 5308 bytes
SHA-256: 4344fdd3f0635edff8ba4390df8583a9206ae5442ed37833d3e33a1537b85689
font_01_sfnt_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 4996 bytes
SHA-256: c575add24c59a9c1b85e50c8f0cbeea281d5a0f7cd8806d514bb64c24b5b1761
font_02_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 10616 bytes
SHA-256: bd25673a3f7b9a5563b94d0a793b0c7e3bf89931e4171553e0b2b0c612e3c2ca