Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0025a611dac735…

MALICIOUS

PDF

88.5 KB Created: 2021-08-07 01:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4a0e765575268d5c2b31d6700220f0e0 SHA-1: 664afd471a562b3bee46baa60a0b0ad31e0ebc9c SHA-256: bf0025a611dac7350ad1853ed65277eb7261ee379f7cee7a2315901e80d2d9a7
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple URLs hosted on compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further exploit stages. No scripts were extracted, but the structure and URL analysis are sufficient to infer a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16089e81d151ef---lodawesunov.pdf In PDF document text
    • http://absolutelyneon.com/userfiles/file/soralumozofotopi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d46a2f79f---2976963375.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/d0417dca385f733df93499723f97314f/laxilofifunodikeweziraz.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/xuburuloxeposiraneru.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/koledenobulexute.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/zenufivarutenubomopikoma.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8be160c11---42402153647.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f943ae3b7b4---vagekamumefutibowos.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/lukugagafinoluwakege.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/83113784058.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/32168170322.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083521995214---xomufowoke.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/pogaperiweruwifugojos.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a47e942ca2c---ronewizanodamepezebepoz.pdfIn PDF document text
    • http://promador.pl/userfiles/file/jutatokusuzodaruvogusafof.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/95cer11b0sjcac391somu3v3oo/49597204254.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ad39c9e18ef---359786353.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097b00e989b7---47984970070.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/vupimapak.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a1ac8ea0---11230349370.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/pezamatuvip.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/zifigow.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8j2kge11e2mc9m5em4rmqokp10/sijirejobigirofajaxunep.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/11161331002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=walmart+custom+cakes+catalogPDF 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_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 17080 bytes
SHA-256: f71297dabfb1e53664c96b3bdf54e7fa7fef02cc51072198aca9e3d03b9361d6
font_01_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 10560 bytes
SHA-256: 7b69b3955e56447042e50fa4e6860e9ba89aeccdd5274de205bce74a1f203c49
font_02_sfnt_off00013bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1