Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb95e4f20c82c9d…

MALICIOUS

PDF

76.7 KB Created: 2021-08-20 04:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d3c5cf49b7bdd15fc89a25672d44b675 SHA-1: c78bd9fe9dac49af346e6a796294572db5a469e1 SHA-256: 6bb95e4f20c82c9d5a3993bdb301ce62b0eafbade9359e751d7b6c956dbfa4d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple domains, with several identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.halpellet.hu/userfiles/files/digimawogonidirepo.pdf In PDF document text
    • http://maduraigarlandshop.com/userfiles/file/xeruxuliripujurezakix.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/62814547895.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c89ba591---peganefasigirerari.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2dvterr1kpdteuvmveo57ips6v/73240566411.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2208b6cc---96977726913.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b843eb24097---8691595948.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a408ecd1d30---xesozusewipimitajigijaja.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e1301bb0c2652ac020426a52f50772af/dewonewajeten.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccdad9a9b5---76324349704.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/28628292195.pdfIn PDF document text
    • http://progetec.org/userfiles/files/rezogedenedalowazexotu.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/gefediwemilobobusiwatila.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/damadenezuk.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6dbfc6b0f---sulerejepureti.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/8639015445.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/faripegokidurijexubuwilu.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/78787565588.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/xerizewib.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/979mmsjpkm2m92dg04ui95igmp/27193668416.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0816c2b44---34845461311.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/34630583300.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/zepoxes.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tci6euc5buppu7rk90mvj2ni33/82022014693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=libro+de+formacion+civica+y+etica+3+grado+de+secundaria+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_off0000c4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CD 11468 bytes
SHA-256: 46cce2c84c3657e408c9aaccf7302851d287f121d5b3c9c726eb0ce064eb6e5f
font_01_sfnt_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 16664 bytes
SHA-256: 81c4c4d129d56830ecd8204ab6c1d1639873913fc300d2ef6d47e45089cb95c3