Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74c9f86b3dd02ed…

MALICIOUS

PDF

77.4 KB Created: 2021-10-11 05:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 30ba761e0d4fe4e8017a6fe2cfdc1578 SHA-1: 112252668fcee28d6cfe6a9d5eef9f0f3506243d SHA-256: e74c9f86b3dd02ededce240078fb85c0e36718302d91d47aa7370b73f10d561e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content or download further payloads. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of using link farms for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=between+your+heart+and+mine+lyrics PDF link annotation
    • https://hippodrome-compiegne.fr/www/uploads/file/taxujo.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/93072601769.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20211003040818.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/22081256601.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/pajubij.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/52559220091.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/tekexukexase.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/35998515105.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/98195085035.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/doxiriroxidowu.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/ruzepisoxidavawoval.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/xodetunoladivawab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616380e75a3a6---30334274849.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/26044426675.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/69238023305.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/91293533788.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3lbtu771hvhec824gql06m0l12/44856239283.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210919120925.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/76115087170.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/josujelerov.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/sapumirapenafivonuwu.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/wurudubekekufuw.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdaa4e94d---nalobovaxakup.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210930153059_ult5mc.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///76480256683.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_off0000c787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC787 17996 bytes
SHA-256: d30c1ca1f7ef57971254382bd0ceb3eb6561728237067a730b1cf6f7e739928a
font_01_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 10988 bytes
SHA-256: b25ce60e7f802a0dfca9e70ec14c1c2eac4ee2663363e672191047939068dd24

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