Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e7e9acfa28094b…

MALICIOUS

PDF

86.0 KB Created: 2021-10-09 02:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 68082d2a115f91adfeeed7a7325cb3f5 SHA-1: a952994922f33ed6078d4172e41f4f29d4cce79c SHA-256: 43e7e9acfa28094b97b51ee29563e55b90a4fc034f308fc8d7c9825507f8b0fa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm pointing to compromised WordPress uploads and disposable hosting. The PDF contains numerous external URIs, suggesting it is designed to redirect users to potentially malicious websites for further exploitation or phishing. No scripts were extracted, but the PDF structure and URI patterns are indicative of a phishing or malware distribution lure.

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://wastran.ru/uplcv?utm_term=cottage+cheese+filling+for+crepes PDF link annotation
    • https://digireg.nz/upload/23564866194.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/71411715171.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/36867791034.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/legesekogutuburupi.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/kepipuradinadesoze.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7b6e02f7babd61f3dc0f625dae51015e/92843890731.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/fapejapaxukadezekotad.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/vawumexitofawir.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/36883335988.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/21121062346.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/tufakivapukunesexowanomaj.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/fososuxutikaz.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210923003044999600.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61f6ac45f---jevumifatuvomoj.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8c97f1610155444f41343711be0aa34f/niviziwes.pdfIn PDF document text
    • https://slide-bearing.com/d/files/61202156633.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16143c59bbebc8---xukaje.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/86662656506.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210910160734.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/57504521750.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/rupoxejibaborogizone.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ab017f535d88e06e5a052b8e229d5404/53637615925.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/wawubedolofisol.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/58422682660.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/betowagivimoremovo.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_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 18848 bytes
SHA-256: 73ea914bf099f5bfb6bc3483d1c0b84dcc5c9e6550683dd0c62cd14ca25ec730
font_01_sfnt_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 10788 bytes
SHA-256: 912aeec77f16437396bd982cdbd046b1de10fb780f71f4419130f66a598bf0b9
font_02_sfnt_off00013213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.