Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10d50781764d66b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 18:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d569ce0f875b30858e2f021292aacd2 SHA-1: ad2ee7e374c0b8f20ff5e6dbc84234a414d25262 SHA-256: b10d50781764d66ba09efbf9a30d3ff68416a7afb829405a4d7de21edcefb545
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=word+problem+involving+rational+functions+with+solution+pdf PDF link annotation
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a83d3de3---bezorizijadijibu.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/laliro.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/rudorokirofopa.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/90160234754.pdfIn PDF document text
    • https://dintek.eu/uploads/file/somabag.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a255de690---80479227251.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/ledokorimuwulogalikelel.pdfIn PDF document text
    • http://atek-ent.com/upload/file/35605178687.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/wawufedimukovapiret.pdfIn PDF document text
    • https://aful.edu.pe/ckfinder/userfiles/files/bexuxobexaduxirubukawuz.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160928e89185f2---99183943624.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/25b0e1d07897ddc3242703f2a58130b1/biladorimomiwabediwif.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/xovukogunexedez.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/1558107097.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc8ccc8f8d---32969370106.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/32281614427.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160805e586d2d1---jibevuwodimosewolegevur.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/peradizolaz.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/ridepomi.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/fivuxogugome.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/fabox.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/57112063129.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/54246249519.pdfIn PDF document text
    • https://bczenekar.hu/files/file/zolonobipereli.pdfIn PDF document text
    • http://cascad-trans.ru/files/gifalebukenudi.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_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 11452 bytes
SHA-256: d82dfdd78fee8596ea44cb065db6b5fe9118dd50a870047e848fb2a684c697f7
font_02_sfnt_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 18044 bytes
SHA-256: 9cee0a4a1ac23bb44c713b1cadf793723e52f41373f1dec262a55acd156dd88b

Open this report in the interactive analyzer, or submit your own file for analysis.