Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1d550f95db2306…

MALICIOUS

PDF

86.8 KB Created: 2021-07-02 07:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17411f453a9f7e952429dad4dbda4401 SHA-1: 3c6c9c8fbb752b67c40bfcb6fd13c40d1e811c51 SHA-256: bc1d550f95db230658d5718ddefd01df038af0a95070af45e0da8c9fb363a109
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm, likely intended to direct users to malicious websites for phishing or malware delivery. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2megndsjal7llrb69u6sisdfc9/tazenor.pdf In PDF document text
    • http://canhtoanland.com/upload/files/govododadobosa.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b9a68cd7b---24623522079.pdfIn PDF document text
    • https://kermanrooz.com/img/files/xoxiwowakiseromewamawolu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079636bb1656---71988605106.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/8c3e0a60348242723ca4acd4a9fda50f/48295776158.pdfIn PDF document text
    • http://fittbike.hu/files/file/zamido.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/18589606644.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab677295e2a---tosawaxuworo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vezasaw.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/63f507c471954fea06329a3a2d4dde36/52657260208.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/766a76e33f8abeee1a7969c9e93c6a1d/ziluzuteladuvexag.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/gasuxaxufivejivavi.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec9877e45c---tomorudi.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/80101369165.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/maneluwokasemef.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d44b68628---vugotirimin.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210601_080455.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/17379263683.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4418142f2512cbe6231df7aa2fa955e8/vufubikivolaba.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4gf2fqt09s827d73h2oiovi9o0/zewamurusifu.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/9826356491.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079791126a90---17440506626.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f1f271bb04e8769232aa5528cb93549f/rovaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cheap+land+for+sale+in+mandeville+jamaicaPDF 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_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 17044 bytes
SHA-256: 85b3f6570cabe2ddc26db385c89032e64da223be349918849e1667d8bb67d0d6
font_01_sfnt_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 11012 bytes
SHA-256: f499aceb2a6abe36a68e702514110ceaadb02553d06b5e0461a14816b8c08c72
font_02_sfnt_off00013414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1