Malicious PDF — malware analysis report

Static analysis result for SHA-256 429d7c85bf42acaf…

MALICIOUS

PDF

76.7 KB Created: 2021-09-21 05:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc2fee6e632dbdef1d819cf6fdf41ab5 SHA-1: 028d272519121b04e94ac3f35d9622ca0936ae7c SHA-256: 429d7c85bf42acaffdc38dfd3b85a018202aa8baba3fd41eb3f1c68069befa70
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple external links points towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jnnycc.org/userfiles/file/jibakewuwurofoxedum.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fba455660---dinegitenabasitopaxuzezo.pdf
    • http://binhchuachay.info/Images_upload/files/vaxeni.pdf
    • http://orvositudasbazis.eu/images/upload/file/mafixux.pdf
    • http://ongxoanhdpe.vn/upload/files/desutotabijesixusig.pdf
    • http://sellmysayarah.com/userfiles/files/50974123369.pdf
    • http://machinegroup.ru/img/outer/files/pomil.pdf
    • https://grup-insaat.com/userfiles/file/39913887636.pdf
    • http://chuaphucluong.com/uploads/image/files/mabamejovudatilab.pdf
    • http://khangvietdn.com/uploads/file/2609585314.pdf
    • https://santa.sg/images/users/00000000/files/piforuz.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ghthjop6p7q6qdcaerorllthok/51277637491.pdf
    • http://wasserburg.pl/userfiles/file/lodasoziwiregipuboruta.pdf
    • http://anticacarsulaeborzoi.eu/userfiles/files/siwebumogigagejovel.pdf
    • https://apsco.ly/userfiles/files/darakagejebusur.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/binosevex.pdf
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/bolawitison.pdf
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/41176313545.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/27893425452.pdf
    • http://aaaexpressheating.com/userfiles/file/27550048243.pdf
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/vuwakidosugevolu.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161459da2d12dd---wufajapukadojes.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161334eb815104---63830462520.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e22dbd1696---naxuwagama.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=discrete+mathematical+structures+book+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ae.bin
33eb9241e05f96c1ed92230b0c898876f3c2af54d55cf9089b7de2ab25a1e6a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AE 17800 bytes
font_01_sfnt_off0000f2d9.bin
4834565bfe3f1046bf72e7f9d9566c4edfeb3b7b1d7612837c9686a120dac551
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 11116 bytes
font_02_sfnt_off00010c93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 16792 bytes