Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b23eec5e5a031c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 21:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9c9925952c758d762712850911e74944 SHA-1: 4892e84c5e5575aca2635593a91ea198539ed5b5 SHA-256: 73b23eec5e5a031c998f6a197e595d13a0a89cc60d8cde7cab81ca215337600e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points towards a tactic of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=how+to+download+music+from+youtube+to+an+android+phone PDF link annotation
    • http://rsti.biz/files/fck/file/vugosixuvujefibalefamer.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/mezezoru.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/76890399581.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3afe87c1c---pevamip.pdfPDF link annotation
    • http://wolfpackbasketballacademy.com/content_docs/fopumigotiporuzegedomek.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210903082148.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/pivefenedoterodedonobipa.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/45374312091.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/dulajafelabupituzonum.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136ead7bc381---sasarofaz.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/nirewitawujef.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/bukinodoxo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ffd9b6e13e46ce2878e4b249705d1031/xadim.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fadez.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/704b3f0add0e8758dc62d871c81b6bcc/lazurinamofifega.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31326798873.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/38587430455.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327fdec6e27---selonigerolamozojevuzupuz.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a3ce07e37---72692181564.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210908_114612.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/pi916n2efbnvb010bep9s7vkq3/46590576070.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/21159396451.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fivepezo.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/38123206115.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_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 11316 bytes
SHA-256: 7a0e1a6d24424bb39c58d547e1097b4894e2b83b654ce52895e8a258b917c88a
font_01_sfnt_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 18644 bytes
SHA-256: cc878ff953841124aeaa5e4b13ec9557b31b300e0e9c707986b7835ea5ddd521

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