Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1e8f32ae36b05a…

MALICIOUS

PDF

171.3 KB Created: 2021-07-06 05:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e6c6fd73cd62a4af6a7bf9ff9acd3a77 SHA-1: b9c4cf38fc9c6f9e6e32dc1c706741ddeaa4dc59 SHA-256: bc1e8f32ae36b05a579bc0961ca1e6d64cbd0c060a80c606f770174e855878d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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=gender+inequality+in+society PDF link annotation
    • http://madmojo.com/fckupload/file/sapudadoditufeposabu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a574270e1---92594125447.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/diduparan.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe256de06c---77756174898.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/46755423022.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/bexesomikapuxesumevowa.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a24634487c3---78563533174.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/85720313745.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/j3po2v2a6u1hqbff7kc6d3tf43/fizedipugenimepoxete.pdfIn PDF document text
    • http://debten.net/UserFiles/File/sesimafotabewapepidi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b043648c375---zowaxezugofusupimejuk.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/13811354022.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/85331652461.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/tumagexipajurukalino.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/apb45095nj3dn7vtnhjj178e6m/56470842388.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51fd8c258c---rilixopeg.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2e2a0d94d---85470351292.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/evfeojo2rtg8fo6cbpsat1o1r7/muwikizelumepun.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/49859309390.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b13cfd88239---99035081299.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/bopexi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3581919800---limenuwaxe.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/rkgpkr2e2ic9k6r82ref71bv53/81993516881.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/joluvaruv.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_off00023d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002555d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2555D 19336 bytes
SHA-256: 8d3a927688bd41d390b006195cd07d89b4e8ec9db07e20f5f23039bf19ddf8ff
font_02_sfnt_off000286b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x286B8 10760 bytes
SHA-256: 667374ed868c7cf43ec4e85dd706ebf7058c96b61e9019ffe6814870b7afc2ef

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