Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b884868f89c019…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 23:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46005523900d55ef2ce71162d14240aa SHA-1: dad6e62969c9012534d7b0eadc9b450e6d1990cd SHA-256: 59b884868f89c019aacd9fe762e1c99550abfbd6f8d5dbfb4f858a78bec014d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution lure, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=shadow+fight+2+god+mode+mod+apk PDF link annotation
    • https://chungangroup.com/uploads/files/202109150858042170.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/88744463291.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/82326913439.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/tukuripetanavuvake.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/98981027503.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c9dc171477f7a71b5c39b5b631b4f280/40989414958.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/falapejujelijisemapinonu.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/nujuvajijezonemovomukew.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/pufusotukikukunag.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/nazisewadegakev.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/xeketipugixosujobivag.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/fenurasalu.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/sadurezuxike.pdfIn PDF document text
    • http://hjhchem.com/upload/files/92038860292.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/3345143870.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/15846268820.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135dcb727d84---tigivukilumuzagexipotof.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/35519800176.pdfIn PDF document text
    • https://betsin.org/userfiles/files/zezalona.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/25195494908.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161455541628a5---tiguwuxor.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210904220234_c3VzYWd1cm96ZXphenVyaQ==.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/noxen.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/pezaturulobumi.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_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 18700 bytes
SHA-256: cdc68b9ac803f2fd8444f07757d0c6d148ad5ef1041999e9dac61584c0c7a92c
font_02_sfnt_off00012a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A79 10900 bytes
SHA-256: bfece5f8eb239233ab1b1f61d482f32f2e18803cfa514972bfcbf6358d4ab2e6