Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e5b91025c31212…

MALICIOUS

PDF

88.1 KB Created: 2021-07-30 15:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b92651701ae6c64baa0a0d83cc6ae45 SHA-1: 2d1d86a15e4d24e9385bad140b2aaa7bd6ee4da4 SHA-256: 04e5b91025c3121299b101c77f32c0fecf0059b04f7859f5931c07019f0019bd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to leverage these for malicious redirects or hosting. The presence of external URIs and a link farm indicates a likely phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://agrobud.net/uploaded/file/87408584161.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7c82d963---zopulekiwomazasirojoxag.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/948d84fa60dafd46a5f9a772520fb891/somugedulepigenozoko.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f188e35a172ed905d05731c3a1776e83/13715234174.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/20688184264.pdfIn PDF document text
    • https://aashianarealty.com/file/36846506051.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/xasaboguwano.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098546c14bec---45536480289.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727fd1e7e1c---67898929894.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/zarolasa.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90135b9609---salijegek.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d478c4d813eb18ff659aed9f7dd3f23b/18875793543.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075e79807222---wekopuxabufejobixa.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b2661f0a9---46997253730.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/43835247597.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/43934826597.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8a5e55e2---xalajesageveradurupelamif.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/lmk6tau3s9ntl30h6ptfi8bp3u/52605435195.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/13311752494.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/nikoruzuxoviwukokojikode.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3ae4d54481f4b471a8ce7a042c0e1881/dadofezorura.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/bupaxadupizo.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160763e9fd99a2---vexibiwofuxapotodad.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/87377065499.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210701233214199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+is+spiral+curriculum+according+to+brunerPDF 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_off0000f3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 17564 bytes
SHA-256: c2e918c3240a15f7b6e8605a9be49dd46b487112bcc8ca38ae5c35ca4785f44a
font_01_sfnt_off00012039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13850 11196 bytes
SHA-256: eee0571e6b1497e3ed04e1b448a316e45e934b84e219b7f21b76547fa85af7e1

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