Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b4034668aa191f…

MALICIOUS

PDF

87.5 KB Created: 2021-07-06 07:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 277890f316cd93f50ab8bc340abb4958 SHA-1: 4c8e88de7646675278f389921e132b6a292e2814 SHA-256: 25b4034668aa191f3709dcbef074501843cf6cf88a6d49636238b750dbffd1b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. The presence of numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, suggests a link farm designed to redirect users to malicious content. The ML classifier output of 0.994817 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c403f04cf6d---fipozojodurexa.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7daf2b1ba20c465cdff2ee0329ab3838/55343347133.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/980484269.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/kojapaboneririp.pdfIn PDF document text
    • https://educhina.mn/editor/files/detafifebesiwagajozi.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/45785118313.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/82599039961.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082951391a2d---bufatumijosekova.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b339afad5a1---64977858600.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/pokuditezibuxugopo.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/df86fcaaa3ffdc457fa4c5897102387c/6972913676.pdfIn PDF document text
    • http://mamam.by/upload/File/file/55602490957.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c7048e953---fuvagabexiwax.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/11899894647.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f3d99802505973548de1f73351987490/gogojudisajibupaxeb.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/11608668539.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/wizaxatuvijemetogoluval.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c814ba15c8334c8003abea8e37504415/11178788186.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/i2q596rkr7i7vq8jeejo96ko7l/pujilogogizirebafelewuma.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/cpt9s9fqka2phtstrqkvde6tm5/xefujadobiwupuvidemefeb.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fc018b3a9---towasofonakiwazilipo.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607db7021191a---mixit.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/83181130410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=potato+wedges+air+fryer+timePDF 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_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 17024 bytes
SHA-256: f410c3cf26eb25aabe42b70043cab1ff703eb2c069f20b6ea70eee085ec05100
font_01_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 10748 bytes
SHA-256: 56d31e81a0306b7459c66b8126e744f4608386aff6bdbee65a2e787e28327773
font_02_sfnt_off00013908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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